Answer to Question #17136 in Mechanics | Relativity for Brianna

Question #17136
a person in a kayak starts paddling, and it accelerates from 0 to .60 m/s in a distance of .41 m. If the combined mass if the person and the kayak is 73 kg, what is the magnitude of the net force acting on the kayak?
Expert's answer
Let's find the acceleration of a kayak:

V = at ==> t = V/a

D = at²/2 = a(V/a)²/2 = aV²/(2a²) = V²/(2a) ==> a = 2V²/D = 2*(0.60[m/s])²/0.41[m] = 1.76[m/s²].

According to the second Newton's law, the magnitude of the net force acting on the kayak is

F = m*a = 73[kg] * 1.76[m/s²] = 128.48[N]

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