A166-g hockey puck is gliding across the ice at 19.5 m/s. a player whacks it with her stick, sending it moving at 43.1 m/s at 45.0∘ to its initial direction of motion. what is the angle between the initial velocity of the puck and the force exerted on the puck? if stick and puck are in contact for 112 ms, what is the magnitude of the average force that was exerted on the puck?

Explanation:

Given

mass of puck=166 gm

initial velocity=19.5 m/s

Final velocity=43.1 m/s at angle of to the intial direction

Suppose puck is travelling towards positive x axis

thus initial moment

Final momentum

Impusle

Angle between initial velocity and force

w.r.t x-axis

and Fdt=Impulse

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.