Question

bullet, moving with a speed of 150 m/s, strikes a
wooden plank. After passing through the plank, its speed
becomes 125 m/s. Another bullet of the same mass and
size strikes the plank with a speed of 90 m/s. Its speed
after passing through the plank would be
(a) 25 m/s
(b) 35 m/s
(c) 50 m/s(d)70 m/s​

Answer 1

Explanation:

150 ---> 125

90 -------> x

x = 90×125/150

x = 90×5/6

x = 450/6

x = 225/3

x= 75m/s