Question

13. A bullet of mass 10 gm is fired from a rifle with a velocity of 800 m/s. After passing
through a mud wall 180 cm thick, the velocity drops to 100 m/s. Calculate the average
resistance of the wall.​

Answer 1

Explanation:

Solution : 

Here,m=10g=10−2kg.m=10g=10-2kg. 

u=800ms−1,s=1m,υ=100ms−1,F=?u=800ms-1,s=1m,υ=100ms-1,F=? 

As work done == change in K.E. 

F×s=12mu2−12mυ2F×s=12mu2-12mυ2 

F×1=12×10−2(8002−1002)F×1=12×10-2(8002-1002) 

=12×10−2×104(64−1)=3150N