An object foils from rest from the top of a building that n 80 stories high. If

Question

An object foils from rest from the top of a building that n 80 stories high. If each story of the building is 4 meter In height. how long would it take for the object to reach the ground? What net force is needed from an object of mass 110 kg (called external object) that Is 10 km away from the scene in part (a) to reach the falling object just before the falling object reaches the ground if the external object begins accelerating at the exact moment the object in part (a) Is released from the top of the building? How fast is the external object going when it finally reaches the falling object?

Explanation / Answer

t=sqrt(2h/g)=sqrt(32) s=1/2*a*t^2=a=2*10000/32 force=110*2*10000/32 v=a*t=sqrt 32*2*10000/32 using momentum conservation and energy conservation Mu-mV=Mu'-mV' and kinetic enrgy conservation

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