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jauneet singh Grade: 12
        a ball is projectd from the ground with the speed of 70m/s at theangle 45*with the vertical so that it strikes a verticall ball at the 490/3 m from the point of projection.if the ball return to the point of projection without any colisson with the ground ,then finf coefficent of restution between baal and the wall
7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear jauneet


Total time of flight


t =2usin45/g =2*70/10√2


                   =7√2


in this time it has to cover 490/3 distance with velocity 70cos45   and  490/3 distance with velocity e70cos45/


7√2 = 490/3*70cos45       + 490/3*e70cos45


7 = 7/3  + 7/3e


1= 1/3 + 1/3e


e=1/2


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Badiuddin

7 years ago
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