Question

A force of 0.9 N acting on a body increases its velocity from 5 ms^-1 to 8 ms^-1 in 2 s. Calculate the mass of the body.

Answer 1

Initial speed of body = 5 ms^-1
Final speed of body = 8 ms^-1
Time taken to acquire this speed = 2 s.
Acceleration of body = ( v- u)/t
a= (8- 5)/2 = 1.5 ms^-2.
Force applied on body = 0.9 N.
we know F = m X a.
m = f/a = 0.9/1.5 = 0.6 kg
mass of the body is 600 gm.