Question

a disc of mass 5 kg is kept floating horizontally in the mid air by firing 10 Bullet per second vertically up if the if the mass of the each Bullet is 50 grams and Bullet rebound with the same speed the speed of the bullet is​

Answer 1

$\huge\bold\red{HELLO!}$

Weight of disc = mg = 5 kg × 10 m/s² = 50 N

Force exerted by 10 bullets must be equal to 50 N

F = Δp / t

F = nm × (v - u) / t

F = nm × (v - (v)) / t

F = 2nmv/t

From above

v = Ft / (2nm)

= (50 N × 1 s) / (2 × 10 × 50 × 10^-3 kg)

= 50 m/s

Speed of each bullet is 50

Answer 2

Explanation:

so this is the correct answer