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From a point on the ground, a particle is projected slantwise with some initial velocity making an acute into air angle with the horizontal. During its flight, the dot product of its velocity and acceleration vectors

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continuously increases

continuously decreases

first increases and then decreases

first decreases and then increases

answer is A.

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Detailed Solution

$\bar{V} . \bar{a} = V a \cos θ$
Upto max hight $θ > 90^{0}$ cos $θ$ negative
From max hight to ground $θ$ is less than 90
$θ$ is positive

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