A swimmer of mass 70\,\text{kg} increases his velocity from 0.0\,\text{m s}^{-1} to 1.4\,\text{m s}^{-1} in 3.5\,\text{s}. The total resistive force of the water on him is 210\,\text{N}. What is the forward force he exerts on the water during this time?

PH-1459

Resultant force and F = ma

Physics · Secondary 4 · Hard · Resultant force and F = ma

A swimmer of mass

70\,\text{kg}

increases his velocity from

0.0\,\text{m s}^{-1}

1.4\,\text{m s}^{-1}

3.5\,\text{s}

. The total resistive force of the water on him is

210\,\text{N}

. What is the forward force he exerts on the water during this time?

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