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Question
From the top of a building 80m high, a ball is thrown horizontally which hits the ground at a distance. The line joining the top of the building to the point where it hits the ground makes an angle of 45o with the ground. Initial velocity of projection of the ball is (g=10m/s2)
From the top of a building 80m high, a ball is thrown horizontally which hits the ground at a distance. The line joining the top of the building to the point where it hits the ground makes an angle of 45o with the ground. Initial velocity of projection of the ball is (g=10m/s2)
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Solution
The correct option is C 20m/s
Given Range =80 mIn vertical direction :
s=ut+12at2⇒−80=0+12×(−10)t2⇒t=4 secIn horizontal direction :
υ=ranget=804m/s=20 m/s
Given Range =80 m
In vertical direction :
s=ut+12at2⇒−80=0+12×(−10)t2⇒t=4 sec
s=ut+12at2⇒−80=0+12×(−10)t2⇒t=4 sec
In horizontal direction :
υ=ranget=804m/s=20 m/s
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