**HOME WORK - 01/11/2019 - PHYSICS - NIOS - 312 - MOTION IN A STRAIGHT LINE - 2
Senior Secondary Course**

**Module I Motion, Force and Energy - HW-02-01**

**Chapter Name - MOTION IN A STRAIGHT LINE - 2
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**Important Questions for NIOS - ODE & PE**

Q1. Is it possible for a moving body to have non-zero average speed but zero average velocity during any given interval of time? If so, explain.

Q2. A lady drove to the market at a speed of 8 km h–1. Finding market closed, she came back home at a speed of 10 km h–1. If the market is 2km away from her home, calculate the average velocity and average speed.

Q3. Can a moving body have zero relative velocity with respect to another body? Give an example.

Q4. A person strolls inside a train with a velocity of 1.0 m s–1 in the direction of motion of the train. If the train is moving with a velocity of 3.0 m s–1, calculate his

(a) velocity as seen by passengers in the compartment, and (b) velocity with respect to a person sitting on the platform.

Q5. A body starting from rest covers a distance of 40 m in 4s with constant acceleration along a straight line. Compute its final velocity and the time required to cover half of the total distance.

Q6. A car moves along a straight road with constant aceleration of 5 ms–2. Initially at 5m, its velocity was 3 ms–1 Compute its position and velocity at t = 2 s.

Q7. With what velocity should a body be thrown vertically upward so that it reaches a height of 25 m? For how long will it be in the air?

Q8. A ball is thrown upward in the air. Is its acceleration greater while it is being thrown or after it is thrown?

Q9. Distinguish between average speed and average velocity.

Q10. A car C moving with a speed of 65 km h–1 on a straight road is ahead of motorcycle M moving with the speed of 80 km h–1 in the same direction. What is the velocity of M relative to A?

Q11. How long does a car take to travel 30m, if it accelerates from rest at a rate of 2.0 m s2?

Q12. A motorcyclist covers half of the distance between two places at a speed of 30 km h–1 and the second half at the speed of 60 kmh–1. Compute the average speed of the motorcycle.

Q13. A duck, flying directly south for the winter, flies with a constant velocity of 20 km h–1 to a distance of 25 km. How long does it take for the duck to fly this distance?

Q14. Bangalore is 1200km from New Delhi by air (straight line distance) and 1500km by train. If it takes 2h by air and 20h by train, calculate the ratio of the average speeds.

Q15. A car accelerates along a straight road from rest to 50 kmh–1 in 5.0 s. What is the magnitude of its average acceleration?

Q18. A body with an initial velocity of 2.0 ms–1 is accelerated at 8.0 ms–2 for 3 seconds. (i) How far does the body travel during the period of acceleration? (ii) How far would the body travel if it were initially at rest?

Q19. A ball is released from rest from the top of a cliff. Taking the top of the cliff as the reference (zero) level and upwards as the positive direction, draw (i) the displacement-time graph, (ii) distance-time graph (iii) velocity-time graph, (iv) speed-time graph.

Q20. A ball thrown vertically upwards with a velocity v0 from the top of the cliff of height h, falls to the beach below. Taking beach as the reference (zero) level, upward as the positive direction, draw the motion graphs. i.e., the graphs between (i) distance-time, (ii) velocity-time, (iii) displacement-time, (iv) speed - time graphs.

Q21. A body is thrown vertically upward, with a velocity of 10m/s. What will be the value of the velocity and acceleration of the body at the highest point?

Q22. Two objects of different masses, one of 10g and other of 100g are dropped from the same height. Will they reach the ground at the same time? Explain your answer.

Q23. What happens to the uniform motion of a body when it is given an acceleration at right angle to its motion?

Q24. What does the slope of velocity-time graph at any instant represent?

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