First slide

Second law

Question

A dish of mass 10 g is kept floating horizontally in the air by firing bullets each of mass 5 g with the same velocity. If 10 bullets are fired per second and the bullets rebound with the same velocity, then the velocity of each bullet is

Moderate

A

196 cm/sec
B

98 cm/sec
C

49 cm/sec
D

none of these

Solution

$\begin{array}{l} n \times mu - n \times (- mu) = Mg \\ \Rightarrow u = \frac{Mg}{2 nm} = \frac{10 \times 980}{2 \times 10 \times 5} cm / s \\ \Rightarrow u = 98 cm / s \end{array}$

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