A spherical body of mass 2kg starting from rest acquires a kinetic...

Given kinetic energy, $\dfrac{1}{2}m{v}^{2} = 10000J$

$⇒ \dfrac{1}{2} \times 2 \times {v}^{2} = 10000$

$⇒ {v}^{2} = 10000$

$⇒ v = 100m{s}^{- 1}$

Also,

$⇒ v = at = a \times 5 = 100$

$⇒ a = 20m{s}^{- 2}$

Therefore, force acting

$F = ma = 2 \times 20 = 40N$