Question

A steel sphere is dropped vertically onto a horizontal metal plate. The sphere hits the plate with a speed u, leaves it at speed v, and rebounds vertically to half its original height. Which expression gives the value of v/u?

Answer 1

a) 1/2√
b)1−1/2√
c) 1/2^2
d) 1/2

Answer 2

compare KE and PE from stage1
to KE and PE of stage 2\[ \frac{ \frac{ 1 }{ 2 }m u ^{2} }{ \frac{ 1 }{ 2 }m v^2 } = \frac{ mgh }{ mg \frac{ h }{ 2 } }\]

Answer 3

Then what?

Answer 4

can u please show me the steps

Answer 5

I remember seeing someone answer this. I think the answer is 1/sqrt(2)?

Answer 6

Correct