A hockey player is moving northward and suddenly turns westward with the same speed to avoid an opponet. The force that acts on the player is.

Options

A. frictional force along westward
B. muscle force along southward
C. frictional force along south-west
D. muscle force along south-west

Answer

B

Explanation

(b) Consider the adjacent diagram

Let OA`=p_(1)`
=Initial momentum of player northward

AB=`p_(2)`=Final momentum of plalyer towards west.
Clearly OB=OA+AB
Change in momentum `=p_(2)-p_(1)`=AB-OA=AB+(-OA) =Clearly resultant AR will be along south-west.