(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

An object is thrown up from the top of a building 50 m high. It rises to a maximum high of 20 m above the roof.

A) when does it land on the ground

B) At what velocity does it land ?

C) When is it 20 m below the roof?

2. Relevant equations

The 4 kinematics equations the ones I used where

Vf = Vi+ at

vf ² = vi ² + 2ax

3. The attempt at a solution

Well I am completely lost now. I don't know if we can do this in one shot or two.

I first found out how much time it takes for the ball to attein maximum height which gave me 2.02 seconds.

After I calculate the time it takes to go from that high to the ground and in total I got 6.35 s

but the textbook gave me 5.84

as for the velocity I had - 42 m/s

but the text book says -37 m/s :S

I kept alot of decimals so I don't think the mistake is there

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# Kinematic problem

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