A 4.80-kg watermelon is dropped from rest from the roof of a 29.0-m -tall buildi

Question

A 4.80-kg watermelon is dropped from rest from the roof of a 29.0-m -tall building and feels no appreciable air resistance.

A- Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground.

B- Just before it strikes the ground, what is the watermelon's kinetic energy?

C- Just before it strikes the ground, what is the watermelon's speed?

D- Would the answer in part A be different if there were appreciable air resistance?

E- Would the answer in part B be different if there were appreciable air resistance?

F- Would the answer in part C be different if there were appreciable air resistance?

Explanation / Answer

Part A

W= mgh

W= 4.80* 9.81* 29.0

W= 1365.55 J

Part B

KE = mgh

KE = 4.80*9.81*29.0

KE = 1365.55 J

Part C

V= sqrt(2*g*h)

V = sqrt ( 2*9.81*29.0)

V= 23.85 m/s

Part D

No

Part E

Yes

Part F

Yes

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