Question

what is the magnitude of the force necessary to accelerate a 20.0 kg mass from rest to 0.500 m/s in a time of 2.0s

Answer 1

First find a using
v=u+at
Here
v-final velocity(in this case 0.500m/s)
u-initial velocity(in this case 0m/s)
t-time taken(in this case 2.0s)
a-acceleration
Then find the magnitude of the force using
F=ma
m-mass
a-acceleration

Answer 2

a=v/t. so .5/2 = 1.

f=m*a so f=(20)*(1) = 20 N

Answer 3

v=u+at

v/t = a

a = 0.5/2 = 1/4m/s^2

f=ma

= 20*1/4 = 5N