Worksheet Chapter 9: Speed and Acceleration

1. Which of the following represents the correct formula for average speed?

2. Fill in the blank: Acceleration is defined as the rate of change of ________ with respect to time.

3. Convert 90 km/h into m/s.

4. A car travels 120 km at a speed of 60 km/h and then travels another 180 km at a speed of 90 km/h. Find the total time taken and the average speed for the whole trip.

5. True or False: An object moving with uniform speed has an acceleration greater than zero.

6. Farhan walks from home to school covering 1.2 km in 15 minutes. He then runs back home in 10 minutes. (a) Convert 1.2 km into meters. (b) Calculate his speed in m/s on the way to school. (c) Calculate his average speed in m/s for the round trip.

7. A van starts from rest and accelerates uniformly at 2 m/s² for 8 seconds. It then maintains this maximum speed for 20 seconds before decelerating to a stop in 4 seconds. (a) Calculate the maximum speed reached by the van. (b) Find the rate of deceleration in the final stage. (c) Calculate the total distance covered during the whole journey.

8. True or False: Deceleration is also known as negative acceleration.

9. A motorcycle travelling at 25 m/s applies brakes and comes to a complete stop in 5 seconds. (a) Calculate its acceleration. (b) State its deceleration.

10. A train accelerates from 12 m/s to 28 m/s in 4 seconds. Calculate its acceleration.