Solution of Physics Numericals for class 9 (set 1 Q14)

Problem Statement

A body of mass 500 g, initially at rest, is acted upon by a force which causes it to move a distance of 4 m in 2 sec. Calculate the force applied.

mass=m = 500 g = 0.5 kg

Initial velocity = u = 0

Distance travelled = s=4 m

Time duration =t= 2 sec
As there is a force, so the motion will be an accelerated motion.
Let the acceleration is a.

From eqn, s = ut + ½ . a. t^2 =  ½ . a. t^2   [as u=0] 
4 = ½  . a . 2^2

a=2 m/s^2

So force applied= m a = 0.5 . 2 N =1 N

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Solution of Physics Numericals for class 9 (set 1 Q14)
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