Question
A body of mass 100 g is at rest. A force acts on it for 3 seconds and the body attains a velocity of 15 cm/ s. Calculate the magnitude of force.
[Ans: 500 dyne]
Solution
Mass (m) = 100 g
Initial velocity (u) = 0 cm/s
Final velocity (v) = 15 cm/s
Time (t) = 3 second
Force = m×(v - u)\over t
= 100 × (15 - 0)\over 3
= 100 × 5
= 500 dyne