# 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/${s}^{2}$] 1.   1/20th of a second         2. 1/40th of a second 3. 1/80th of a second           4. 1/120th of a second

What is the name of book
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Aakash module
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-4000 N
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Second question ans is A 1/20 th of the second
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