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  4. Assertion If force is not parallel to the velocity of the body, but makes some angle with it, it changes the component of velocity along the direction of force. Reason The component of velocity normal to the force remains unchanged.

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Q. Assertion If force is not parallel to the velocity of the body, but makes some angle with it, it changes the component of velocity along the direction of force.
Reason The component of velocity normal to the force remains unchanged.

Laws of Motion

Solution:

Force is a vector quantity. Thus, if force is not parallel to the velocity of the body, but makes some angle with it, it changes the component of velocity along the direction of force.
The component of velocity normal to the force remains unchanged, e.g. in projectile motion, horizontal component of velocity does not change under the effect of vertical gravitational force.
Therefore, Assertion and Reason are correct but Reason is not the correct explanation of Assertion.