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Sagot :
Answer:
1) 28,160.33 J
2) 30.99 m/s
Step-by-step explanation:
1)
Kinetic energy is given by the formula ...
KE = 1/2mv^2 . . . . . m represents mass
KE = (1/2)(34 kg)(40.7 m/s)² = 28,160.33 J
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2)
The potential energy is converted to kinetic energy.
mgh = 1/2mv² . . . . m represents mass
v = √(2gh) . . . . . . m cancels when we multiply by 2/m.
v = √(2·9.8 m/s²·49 m) ≈ 30.99 m/s . . . . . m represents meters
The speed at the bottom is about 30.99 m/s.
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Additional comment
Rounding to 2 significant digits, the answers would be ...
28,000 J
31 m/s
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