Question

A body of mass 2 kg starts from rest and moves with uniform acceleration.It acquires a velocity 20$m{s}^{-1}$ in 4 s.
The power experted on the body at 2 s is

• A. 50 W
• B. 100 W
• C. 150 W
• D. 200 W

Answer 1

The correct option is B 100 W

$m=2kg$ $a=\frac{v-u}{t}=5m/s^2$

$\Rightarrow S=10m$

$\Rightarrow$ Power $=10\times 2\times 5$

$=100W.$

Hence, the answer is $100w.$