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Free Fall

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Acceleration of ball inside water

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Q. A train is moving along a straight line with a constant acceleration. A boy standing inside the train throws a ball in forward direction with a speed of

10 m/s

60^{\circ}

to the horizontal, with respect to himself. The boy has to move forward by

1.15 m

inside the train to catch the ball (at the initial height). Then,
[Take

g = 10 {m/s}^{2}

Q. A ball is thrown into a lake from a tower

20 m

above the water surface. The ball hits the water after

1 sec

with a velocity

v

and then sinks to the bottom of the lake. It comes to rest at the bottom of the lake

6 sec

after it was thrown. Find the acceleration of the ball inside the lake and the depth of the lake.

Q. A ball of relative density

0.8

falls into water from a height of

2 m

above the surface of water. The depth inside water upto which the ball will sink is:

(neglect viscous forces)

Q. A lift is moving up with acceleration a. A person inside the lift throws the ball upwards with a velocity u relative to hand. What is the time of flight of the ball?

Q. A lift is moving down with acceleration

a

. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively.

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