A ball thrown up from a rooftop of height 40 m lands on the ground in 4.2 s.?

Question

a) What is the maximum height above the ground?

b) What is its speed 19 m below the rooftop?

Answer 1

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a) Maximum height = 46.253 m

b) Velocity at 21 m (19 m below rooftop) = 22.258 m/s

Source(s): I'm an engineering grad.

Answer 2

For a) the maximum height is 86.436 m I think.