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Standard X
Physics
Free Fall
Acceleration ...
Question
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
at an angle of
60
∘
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
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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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