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lesantik [10]
4 years ago
10

An 80 kg skateboarder moving at 3 m/s pushes off with her back foot to move faster.

Physics
2 answers:
Dmitry [639]4 years ago
5 0

Answer:

640 J

640 J

Explanation:

ΔKE = ½ mv² − ½ mu²

ΔKE = ½ m (v² − u²)

ΔKE = ½ (80 kg) ((5 m/s)² − (3 m/s)²)

ΔKE = 640 J

Work = ΔE

Work = 640 J

Romashka [77]4 years ago
4 0

Answer:

640 for both

Explanation:

got right on edg

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