Following graph represents the velocity-time graph of an object of mass 20 kg.

Find out

- the distance travelled by the object in 10 s.
- the force on object from t = 10stot = 15s.

Following graph represents the velocity-time graph of an object of mass 20 kg.

Find out

- the distance travelled by the object in 10 s.
- the force on object from t = 10stot = 15s.

- Since, we know that distance covered by a body,

Distance = Area under velocity - time graph

∴ The distance covered by the object from t = 0 to t = 10 s.

- From the graph, the object comes to rest at t =15s.

Speed of the object at t = 10 s, u = 50 m/s

Speed of the object at t = 15 s, v = 0

and the time interval for change in speed, Δt = 15 - 10 = 5s

∴ Acceleration of the object,

Since, force, F = mass x acceleration = 20 x -10 = -200 N

The negative sign implies that the force is in opposite direction to the velocity of the objecet.