Question

a force acting on a partical of mass 200g.the displaces it through 400cm in 2s. find the magnitude of the force if the initial velocity of the partical is zero.

Answer 1

If the initial velocity of the particle is zero then acceleration is,

a = 2s/t^2

Here, 

s=400 cm=4 m and t=2 s. 

So we have,

a=2×4/2^2=2

Now,

mass m=200 g = 0.2 kg.

So force f=ma=0.2×2=0.4 N

Answer 2

first good question
now 200g =.2 kg
and 400cm=4m
time = 2s
f=mass * acceleration
now s=ur+1/2at square
now 4m=0*2+1/2a4
now 4m =0 +1/2a4
4m*2=0+1a4
8m=4a
a=2m/square
now f=.2*2
=.4N


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