Q. A 10 g bullet moving at 200 m/s stops after penetrating 5 cm of wooden plank. The average force exerted on the bullet will be
1) 2000 N 2) -2000 N
3) 4000 N 4) -4000 N
Q. A ball mass 50 g is dropped from a height of 20 m . A boy on the ground hits ball vertically upwards with a bat with an average force of 200 N. so that it attains a vertical height of 45 m. The time for which the ball remains in contact with the bat is [Take g= 10 m/]
1. 1/20th of a second 2. 1/40th of a second
3. 1/80th of a second 4. 1/120th of a second