Question

The velocity – time graph of an object of mass 50 gm is shown in fig. Study this graph and answer the following questions: (a) Calculate the force acting on the object in the time interval 0 – 3 sec., (b) Calculate the force acting on the object in the time interval 5– 8sec., (c) Is there any time interval where no force is acting on the object?

Answer 1

Explanation:

1) acceleration = v-u/t

a= 120-0/3 =40m/s

m= 50/1000 ( as u have to convert g to kg)

m= 1/20

F= ma = 1/20 x 40 = 2N

2) 0x120 / 10-6 = -120/4 = -30m/s^2

1/20 x -30 = -1.5 N

3) velocity of the object is constant and so the acceleration is 0.

Hope it helps....!