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NEET PHYSICSMedium

A football player is moving southward and suddenly turns eastward with the same speed to avoid an opponent. The force that acts on the player while turning is

A

Along eastward

B

Along northward

C

Along north-east

D

Along south-west

Step-by-Step Solution

Initial velocity v⃗i=−vj^\vec{v}_i = -v\hat{j}. Final velocity v⃗f=vi^\vec{v}_f = v\hat{i}. Change in velocity Δv⃗=v⃗f−v⃗i=vi^−(−vj^)=vi^+vj^\Delta \vec{v} = \vec{v}_f - \vec{v}_i = v\hat{i} - (-v\hat{j}) = v\hat{i} + v\hat{j}. The force is in the direction of Δv⃗\Delta \vec{v}, which is North-East.

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