How much work must be done on a 5-kg sled to increase its speed from 10 m/s to 15 m/s? A. 25 B. 312.5 J <

Question

How much work must be done on a 5-kg sled to increase its speed from 10
m/s to 15 m/s?

A. 25

B. 312.5 J

C. 562.5 J
D. 5

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Thanh Thu 3 months 2021-07-24T15:09:25+00:00 1 Answers 3 views 0

Answers ( )

    0
    2021-07-24T15:10:42+00:00

    Answer:

    B. 312.5 J

    Explanation:

    Work = change in energy

    W = ½ mv₂² − ½ mv₁²

    W = ½ m (v₂² − v₁²)

    W = ½ (5 kg) ((15 m/s)² − (10 m/s)²)

    W = 312.5 J

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