Question

machine gun fire a bullet mass 40g with velocity 1200ms^-1.man holding it can exert force 144N on gun. how many bullet can fired per sec.

Answer 1

F = nmv / t

n = Ft / mv
= (144 N × 1 second) / (40 g × 10^-3 kg/g × 1200 m/s)
= 3 bullets

Machine gun can fire 3 bullets in each second.

Answer 2

Answer:

Explanation:

First convert mass into kg.

40g=1/25 kg

Now find acceleration=

(V-U)/t= 1200-0/1=1200m/s

Now find force

Force=mass*acceleration

F=1/25*1200

F=48N

Now solve it in unitary method

=

if 48N can fire 1 bullet

1N can fire 1/48 bullet

144N can fire 1/48*144 bullets

=3 bullets(ANS)