Question

A dice of mass 5 kg is kept floating horizontally in midair by firing 10 bullets per second vertically up If the mass of each bullet is 50 gm and bullets rebound with same speed, the speed of each is, (g 10 ms-2) (A) 100 ms (B) 200 ms -1 (C) 50 ms 2 (D) 10 ms -1​

Answer 1

Answer:

Disc floating in air by firing 10bullets per sec.The net force action above the disc is balanced their weight.

Change in momentom per second=10×mv

F×1=10×50×v×10

−3

Where v is velocity of bullet fired.t

F=Mg

v=

0.5

5×10

=100m/s