Question

A vehicle of mass 20kg is moving with a velocity of 4${ms}^{-1}$. Find the magnitude of the force that is to be applied on the vehicle so that the vehicle have a velocity of 1${ms}^{-1}$ after travelling a distance of 20m

• A. 4N
• B. 6N
• C. 7.5N
• D. 9.5N

Answer 1

The correct option is C 7.5N

We know,

$v^2-u^2=2as$

Given,

$s=20m,v=1,u=4$

$a=\frac{-15}{40}=\frac{-3}{8}$

$F=ma=\frac{-60}{8}=-7.5N$

Magnitude$=7.5N$

Option $\text{C}$ is the correct answer