Question

A force acts on a body of mass 200 g. The velocity of the body changes from 15 m $s^{-1}$ to 25 m $s^{-1}$ in 2.5 s. What is magnitude of the force, assuming the force to be constant?

• A. 0.4 N
• B. 0.5 N
• C. 0.6 N
• D. 0.8 N

Answer 1

The correct option is D 0.8 N

$a=\frac{\Delta v}{\Delta t}=\frac{25-15}{2.5}=4m{s}^{-2}$

$F=ma=0.2\times 4=0.8N$