Question

A bullet of mass 0.4kg is shot from a refile with a speed 100m/s. If the bullet penetrates through a 5cm wall with a velocity of 2 m/s, what is the force exerted by the wall on the bullet?

Answer 1

Explanation :F=ma, where F is force, m is the mass and a is the acceleration. (iv) The restive force on the bullet is: F=0.05×−250000=−12500N/Correct option is A) Let the recoil velocity of gun be V. Mass of gun M gun =5.0 kg Mass of bullet M bullet =0.01 kg Velocity of bullet V bullet =250 m/s Initial momentum of the system P i =0 Applying the conservation of linear momentum : P f =P i Or M gun V+M bullet ​ V bullet =0 Or 5×V+0.01×250=0 ⟹ V=−0.5 m/s