If a 1.3 kg ball is dropped from the top of a 33.7 meter building what is its potential energy before it is dropped? B) What is the maximum velocity of the ball in problem 1 just before it hits the ground?
C) How much kinetic energy does the ball in problem 1 have after it has fallen 10 m down the building?

429.338 J; 25.7 m/s; 127.4 J

Explanation:

Given

mass of ball m=1.3 kg

Height of building H=33.7 m

(a)Potential Energy before dropping

(b)Velocity Just before hitting the ground

(c)After falling 10 m

Here initial velocity is zero

using

Here,

Putting values

So, kinetic energy  

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