Question

if a 175 g stationary hockey puck is struck with a force of 405 N east through a displacement of 245 mm east while in contact with a stick, determine the velocity of the puck as it leaves the stick.

Answer 1

a = F/m

a = 405/175

vf = a t where vf is final speed at .245 meters and t is acceleration time

average speed = vf/2

.245 = average speed * t
.245 = ( vf/2) t
so
vf t =.49 but vf = a t
so
a t^2 = .49 (same as d = (1/2) a t^2 )
solve for t
then
Vf = a t