What is the final speed

Question

A force of 3.7 N is exerted on a 105-gram hockey puck over a distance of 2 meters. If it was initially at rest, what is the final speed of the hockey puck?

Answer 1

Use the kinematic relation

v² - v₀² = 2ax

v₀ = 0 (initially at rest)

v² = 2ax

v = √(2ax)

a = F/m

v = √[2(F/m)x]

Plug in these numbers and get v in m/s:

F = 3.7 N

m = 0.105 kg

x = 2 meters