Question

A person in a kayak starts paddling, and it accelerates from 0 to 0.65 m/s in a distance of 0.39 m. If the combined mass of the person and the kayak is 72 kg, what is the magnitude of the net force acting on the kayak?

Could you please show your work as well? Thank you!

Answer 1

Here ,

initial speed , u= 0 m/s

final speed ,v = 0.65 m/s

d = 0.39 m

let the force is F

Using work energy theorem

change in kinetic energy = net work done

0.50 * 72 * 0.65^2 = F * 0.39

solving for F

F = 39 N

the magnitude of net force is 39 N