a 5 kg brick falls off a 4 m high roof it reaches the ground with a speed of of 8.85 m/s what is the kinetic energy of the brick when it starts to fall and when it reaches the ground
A 5 kg brick falls off a 4 m high roof it reaches the ground with a speed of of 8.85 m/s what is the kinetic energy of the brick when it starts to fall and when it reaches the ground?
Answers & Comments
Kinetic Energy
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A 5 kg brick falls off a 4 m high roof it reaches the ground with a speed of of 8.85 m/s what is the kinetic energy of the brick when it starts to fall and when it reaches the ground?
Given:
Answer & Solution:
KE = ½ mv²
KE = ½ (5 kg)(8.85 m/s)²
KE = ½ (5 kg)(78.3225 m²/s²)
KE = ½ (391.6125 kg.m²/s²)
KE = 195.80625 kg.m²/s²
KE = 195.80625 J
Therefore, the kinetic energy is 195.80625 J.
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