Question

How long should a force of 100N act on a body of 20kg . so that it acquire a velocity of 100m/s.​

Answer 1

So acceleration of the body can be calculated as:

F = ma

F = 100 N and m = 20 kg

a = 100/20 = 5 m/s2

Since, the force is acting constantly over the body, the acceleration is uniform; the equations of motion can be applied:

v = u + at

Where v = 100 m/sec, a = 5 m/s2 and u = 0 (rest).

t = v/a = 100/5 = 20 sec

Answer 2

Answer

F=100N

M=20K

V=100m/s

F=m x a

100=20xA

a =100/20=5m/s

A=v-u/t

5=100-0/t

t=100/5=20sec

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