Question

A force of 40 N moves a box of mass 30 kg at rest, to the velocity of 10 ms For how long the force is applied on the box


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Answer 1

Answer:

7.5 sec

Explanation:

Answer 2

Answer:

7.5 seconds

Explanation:

According to Newton's 2nd law of motion force is directly proportional to change in momentum.

Therefore:-

i) F∝ΔP

or

$F=\frac{M(Vf-Vi)}{t}$

[as  P = mv]

where :

Vf = 10

Vi = 0

t = ?

F = 40

You should be able to solve after inserting values .