Motion 1 - SS1 Physics Past Questions and Answers - page 3

To calculate average speed, we divide the total distance travelled by the total time taken.

Total distance = 10 metres (from the graph)

Total time = 4 seconds (from the graph)

Average speed = Total distance / Total time

Average speed = 10 metres / 4 seconds

Average speed = 2.5 m/s

To calculate the total distance travelled, we need to find the area under the speed-time graph. In this case, it is a triangle.

Base = 6 seconds (from the graph)

Height = 20 m/s (from the graph)

Area of the triangle = (1/2) X base X height

Area of the triangle = (1/2) X 6 seconds X 20 m/s

Area of the triangle = 60 metres

Therefore, the total distance travelled by the object during the first 6 seconds is 60 meters.

Acceleration can be calculated using the formula:

Acceleration = Change in velocity / Change in time

From the graph, we can see that the object's velocity remains constant between 6 seconds and 10 seconds. Therefore, there is no change in velocity, and the acceleration is zero.