Problem 1:
The ball has kinetic energy.
Given:
m = 2.1 kg
v = 30 m/s
Required:
KE
Equation:
[tex]KE = \dfrac{1}{2}mv^{2}[/tex]
Solution:
[tex]KE = \dfrac{1}{2}mv^{2}[/tex]
[tex]KE = \dfrac{1}{2}(\text{2.1 kg})(\text{30 m/s})^{2}[/tex]
[tex]\boxed{KE = \text{945 J}}[/tex]
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)
[tex]\boxed{PE = \text{308.7 J}}[/tex]
Answer:
308.7 J
[tex]\\[/tex]
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