11:18 AM T 80% OO AT&T; LTE session masteringphysics.com Exercise 6.14 Mastering
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Question
11:18 AM T 80% OO AT&T; LTE session masteringphysics.com Exercise 6.14 Mastering Physics A 5.10-kg watermelon is dropped from rest from the roof of a 29.0- m -tall building and feels no appreciable air resistance. Part A Calculate the work done by gravity on the watermelon during its displacement from the roof to the ground. Give Up Submit Part B Just before it strikes the ground, what is the watermelon's kinetic energy? Give Up Submit Part C Just before it strikes the ground,what is the watermelon's speed? v E m/s Submit Give UpExplanation / Answer
here,
mass , m = 5.1 kg
height , h = 29 m
A)
the work done by gravity on the watermelon during displacement from the roof to the ground , Wg = m * g * h
Wg = 5.1 * 9.81 * 29 J
Wg = 1450.9 J
B)
the kinetic energy gained = work done = 1450.9 J
C)
let the speed be v
0.5 * m * v^2 = KE
0.5 * 5.1 * v^2 = 1450.9
v = 23.9 m/s
D)
when air resistance is present
the work done by the gravity is same as part A)
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