Assertion: A particle is projected with velocity at an angle of to the ground

PHYSICS · Subjective · CBSE · Physics · Work, Energy and Power · Work, Energy and Power

Problem

Assertion: A particle is projected with velocity

\mathbf{u}

at an angle of

45^\circ

to the ground. Let

\mathbf{v}

be the velocity of the particle at time

t\ne0

. Then

\mathbf{u}\cdot\mathbf{v}

can be zero. Reason: The dot product of two vectors is zero when the angle between them is

90^\circ