First slide

Second law

Question

In a football match a ball is kicked by a player with a force of 25 N for 0.2 s and then by another player with a force of 70 N for 0.1 s in the same direction. If the ball gains a velocity of 24 m/s after two kicks, the mass of ball is

Moderate

A

5 kg
B

10 kg
C

2.5 kg
D

0.5 kg

Solution

$\begin{array}{l} mV = F_{1} t_{1} + F_{2} t_{2} \\ m \times 24 = 25 \times 0.2 + 70 \times 0.1 \\ m \times 24 = 12 \\ m = 0.5 kg \end{array}$

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