Question

A person in a kayak starts paddling, and it accelerates from 0 to 0.413 m/s in a distance of 0.313 m. If the combined mass of the person and the kayak is 72.1 kg, what is the magnitude of the net force acting on the kayak?

Answer 1

First find acceleration.

v^2 - u^2 = 2aS

=> 0.413^2 - 0 = 2a*0.313

=> a = (0.413*0.413)/(2*0.313) = 0.27 m/s^2

Then find net force.

F = ma

=> F = 72.1 * 0.27 = 19.64 N