A bullet of mass 20 g is fired from a rifle with a velocity of 800 ms –1 . After passing through a mud wall 100 cm thick, velocity drops to 100 m s -1 . What is the average resistance of the wall?
(Neglect friction due to air and work of gravity)
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(F = 6300 N)
Sol. Work done by resistive = W R = 
K
= 
× 20 × 10 –3 (100 2 – 800 2 )
= – 6300 J
So, average resistive force <R> = 
= 6300 N.
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