A ball is thrown vertically downward with a velocity of 20m/s from the top of a tower. It hits the ground after some time with a velocity of 80m/s. The height of the tower is : (g=10m/s2)
A
340m
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B
320m
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C
300m
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D
360m
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Solution
The correct option is D300m The initial velocity of the ball is =20m/s.
The final velocity of the ball is =80m/s.
The acceleration due to gravity is =10m/s2.
So, the height of the tower can be obtained from the expression: