A bullet moving with a speed of 150 m/s strikes a wooden plank. After passing through the plank its speed becomes 125ms-1. Another bullet of the same mass and size strikes the plank with a speed of 90m/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:A
A bullet moving with a speed of 150 m/s strikes a wooden plank. After passing through the plank its speed becomes 125ms-1. Another bullet of the same mass and size strikes the plank with a speed of 90m/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