14. A ball is projected upward at time t = 0.0 s from a point on a roof 90 m ab

Physics
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14. A ball is projected upward at time t = 0.0 s from a point on a roof 90 m above the ground. The ball rises, then falls and strikes the ground. The initial velocity of the ball is 80.5m/s The velocity of the ball when it is 89m above the ground is about
May 18th, 2015

hello there welcome to study pool

to up ward direction

v^2=u^2+2as

v^2=80.5^2-2*9.81*(89-90)

v^2=80.5^2+2*9.81*1

v^2=6499.87

v=80.62 m/s


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May 18th, 2015

-64 m/s

-48 m/s

-97 m/s

-81 m/s

-32 m/s

so..... whats the answer?

May 18th, 2015

so the answer is -81m/s

May 18th, 2015

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