Question

A body mass of 4kg initally at rest is subjected to a force of 16n .What is the kinectic energy accquried by the body at last 10 sec ?

Answer 1

➡️mass=4Kg

➡️initial velocity=0.(u)

➡️Force=16N

Force=mass×acceleration

16=4×a

a=4m/s^2

$now \: using \: equation \: of \: motion \\ v = u + at \\ \\ v = 0 + 4 \times 10 \\ v = 40m {sec}^{ - }$
$kinetic \: energy = \frac{1}{2} m {v}^{2} \\ = \frac{1}{2} \times 4 \times {40}^{2} \\ = \frac{1}{2} \times 4 \times 1600 \\ \\ = 3200 \: joules$