Question

A bullet of mass 10gm strikes a fixed target and penetrates 8cm into it. If the average resistance offered by the target to the bullet odds 100N. The velocity with which the bullet hits the target is _______

Answer 1

distance 8 cm

u =?

v=0

force -100N

mass= 0.01 kg

F=ma

-100=0.01×a

-100/0.01= a

-10000 m/s^2

v^2-u^2=2as

0-u^2 =2×-10000×0.08

-u^2 = - 1600

u=40 m /s

Answer 2

F=100N m=0.01kg

F=ma

100=0.01*a

a=100/0.01=10000m/s2

V^2-u^2=2as

V^2=2*10000*0.08=1600

V^2=1600

Take square root ,u will get the answer.