First slide

Second law

Question

In a legend the hero kicked a baby pig so that he is projected with a speed greater than that of his cry. If the weight of the baby pig is assumed to be 5 kg and the time of contact 0.01 sec, the force with which the hero kicked him was:

Easy

A

5x10^-2N
B

2 x 10⁵N
C

1.65 x 10⁵N
D

1.65 x 10³N

Solution

$F_{av} = \frac{Δ p}{Δ t} = \frac{m v}{Δ t} = \frac{(5) (330)}{0.01} = 1.65 \times 10^{5} N$
(Note :- Speed of sound =330 m/s)

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