Harder, better, faster, stronger

Classical Mechanics Level 3

The strength of the force $F$ acting on a body increases from $0$ to $F_{1} = 10 \text{ N}$ at the constant rate of $10 \text{ Ns}^{-1}$ .

During this time, the body, starting from a standstill, reaches the speed of $v = 50 \text{ ms}^{-1}$ .

Calculate the mass of the body in $\text{kg}$ .