Adog running at cistant speed of 3m/s increases its speed to 7m/s upon seeing a lion.if the mass the dog is 20kg,the work it does in achieving the new speed is?
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Answer:
400 J
Explanation:
Work = Change in Kinetic energy
= ½m(v² - u²)
= ½ × 20 kg × [(7 m/s)² - (3 m/s)²]
= 10 kg × 40 m²/s²
= 400 J
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