Question

For how long should a force of 10 N act on a body of 20 kg so that it acquires a velocity of 100 m/s ?

Answer 1

assuming u=0
F=ma
F=mv/t
t=mv/F
=20×100/10
=200s
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Answer 2

$\large\blue{heya mate!!}$

Force = 20 N

Mass = 20 kg

From Newton's second law

Acceleration = Force / Mass

= 20 N / (20 kg)

= 1 m/s²

Now, use equation of motion

v = u + at

Where

v = Velocity after time "t'

u = Velocity when "t = 0"

a = Acceleration of body

t = Time taken for the body to change its velocity from "u" to "v"

t = (v - u)/a

= (100 m/s - 0 m/s) / (1 m/s²)

= 100 s