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NCERT Class Wise Solutions

#### Questions List of Chapter - 1 Motion

- Question 1 - An athlete completes one round of a circular track of diameter 200 m in 40 s. What will be the distance covered and the displacement at the end of 2 minutes 20 s?
- Question 2 - Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 30 seconds and then turns around and jogs 100 m back to point C in another 1 minute.
- Question 3 - Abdul, while driving to school, computes the average speed for his trip to be 20 kmh–1. On his return trip along the same route, there is less traffic and the average speed is 30 kmh–1. What is the average speed for Abdul’s trip?
- Question 4 - A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of 3.0 ms–2 for 8.0 s. How far does the boat travel during this time?
- Question 5 - A driver of a car travelling at 52 km h–1 applies the brakes and accelerates uniformly in the opposite direction. The car stops in 5 s. Another driver going at 3 km h–1 in another car applies his brakes slowly and stops in 10 s.
- Question 6 - Fig 8.11 shows the distance-time graph of three objects A, B and C. Study the graph and answer the following questions:
- Question 7 - A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground?
- Question 8 - The speed-time graph for a car is shown is Fig. 8.12. (a) Find how far does the car travel in the first 4 seconds. Shade the area on the graph that represents the distance travelled by the car during the period.
- Question 9 - State which of the following situations are possible and give an example for each of these: (a) an object with a constant acceleration but with zero velocity.
- Question 10 - An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

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