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How much work should be done on a bicycle of mass 20kg to increase its speed from 2 m/s to 5m/s...​

Answer»

ANSWER:

210 \: joules

EXPLANATION:

w =  \frac{1}{2} m( {v}^{2}  -  {u}^{2} ) \\  \\  =  \frac{1}{2}  \times 20 \times ( {5}^{2}  -  {2}^{2} ) \\  \\  = 10 \times 21 \\  \\  = 210 \: joules



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