The speed-time graph for a car is shown is Fig. 7.11.

(b) Which part of the graph represents uniform motion of the car?

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.

Fig 7.10 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

(c) How far has C travelled when B passes A?

Fig 7.10 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

(d) How far has B travelled by the time it passes C?

A driver of a car travelling at $52 km h^{-1}$ applies the brakes. (a) Shade the area on the graph that represents the distance travelled by the car during the period.

State which of the following situations are possible and give an example for each of these:
(b) an object moving with an acceleration but with uniform speed.

A motorboat starting from rest on a lake accelerates in a straight line at a constant rate of $3.0 m s^{-2}$ for 8.0 s. How far does the boat travel during this time?

Fig 7.10 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

(b) Are all three ever at the same point on the road?

A driver of a car travelling at $52 km h^{-1}$ applies the brakes. (b) Which part of the graph represents uniform motion of the car?

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?

Fig 7.10 shows the distance-time graph of three objects A,B and C. Study the graph and answer the following questions:

(a) Which of the three is travelling the fastest?

 

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?

State which of the following situations are possible and give an example for each of these:
(c) an object moving in a certain direction with an acceleration in the perpendicular direction.

Abdul, while driving to school, computes the average speed for his trip to be $20 km h^{-1}$. On his return trip along the same route, there is less traffic and the average speed is $30 km h^{-1}$. What is the average speed for Abdul’s trip?

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. What are Joseph’s average speeds and velocities in jogging (a) from A to B?

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. What are Joseph’s average speeds and velocities in jogging (b) from A to C?

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

The speed-time graph for a car is shown is Fig. 7.11.

(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.