# Harder, better, faster, stronger

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 $\text{kg}$.

###### Problem taken from the 2015 Italian Physics Olympiad - 2nd Level.
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