The instantaneous acceleration of the point of contact during rolling is zero.

The instantaneous speed of the point of contact during rolling is zero.

A point of contact between two neurons is …………

Give examples for the particle where (a) the velocity is in opposite direction to the acceleration (b)the velocity of the particle is zero but is acceleration is not zero.

Circles with radii 3,4,5 are touching each other externally . If P is the point of intersection of tangents to these circles at their points of contact, the distance of P from the point of contact is