1.YOU SERVE A VOLLEYBALL WITH A MASS OF 2.1 KG. THE BALL LEAVES YOUR HAND WITH A SPEED OF 30m/s.THE BALL HAS ______ENERGY. CALCULATE IT.
2.A BABY CARRIAGE IS SITTING AT THE TOP OF A HILL THAT IS 21 m HIGH. THE CARRIAGE WITH THE BABY HAS A MASS OF 1.5 kg. THE CARRIAGE HAS ______ENERGY. CALCULATE IT
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Problem 1:
The ball has kinetic energy.
Given:
m = 2.1 kg
v = 30 m/s
Required:
KE
Equation:
Solution:
Answer:
945 J
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Problem 2:
The carriage has potential energy.
Given:
m = 1.5 kg
g = 9.8 m/s²
h = 21 m
Required:
PE
Equation:
PE = mgh
Solution:
PE = mgh
PE = (1.5 kg)(9.8 m/s²)(21 m)
Answer:
308.7 J