Question

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

Answer 1

Answer:

$210 \: joules$

Explanation:

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