A boy throws a stone vertically upwards from a bridge is 20m above the surface is water.the stone strikes the water surface 8sec after its release.caluculate the speed by which the stone was thrown up?
Answers
Given:
The was thrown vertically upwards from a bridge which is 20 metres above water. The stone hits water after 8 sec.
To find:
Initial velocity of water ?
Calculation:
Even though the stone was thrown upwards, the displacement of the stone upon reaching the water surface will be 20 metres.
Applying EQUATIONS OF KINEMATICS:
Here direction of displacement & gravity is same. However, direction of initial velocity is opposite.
So, initial velocity of throwing the ball was 37.5 m/s
Answer:
Given:
The was thrown vertically upwards from a bridge which is 20 metres above water. The stone hits water after 8 sec.
To find:
Initial velocity of water ?
Calculation:
Even though the stone was thrown upwards, the displacement of the stone upon reaching the water surface will be 20 metres.
Applying EQUATIONS OF KINEMATICS:
Here direction of displacement & gravity is same. However, direction of initial velocity is opposite.
So, initial velocity of throwing the ball was 37.5 m/s
Step-by-step explanation:
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