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  • A disc of mass 20 g is kept floating horizontally by firing 10 bullets per second against it from below. The b

A disc of mass 20 g is kept floating horizontally by firing 10 bullets per second against it from below. The bullets strike the disc normally and rebound downwards with the same speed. If the mass of each bullet is 10 g, the velocity with which the marbles are striking the disc is (g=9.8m/s2)

Option: 1

9.8


Option: 2

98


Option: 3

0.98


Option: 4

48


Answers (1)

best_answer

 

m_1 g = \frac{n \times (m \Delta v)}{\Delta t}

20\times g = \frac{10 \times (10\times 2v)}{1}

v = 0.98 m/s^2

Posted by

Rishi

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