The correct statement from the following is
A body having zero velocity will not necessarily have zero acceleration
A body having zero velocity will necessarily have zero acceleration
A body having uniform speed can have only uniform acceleration
A body having non-uniform velocity will have zero acceleration
A particle moves towards east with velocity $5\, m/s$. After $10$ seconds its direction changes towards north with same velocity. The average acceleration of the particle is
An object with a mass $10 \,kg$ moves at a constant velocity of $10 \,m/sec$. A constant force then acts for $4\, second$ on the object and gives it a speed of $2\, m/sec$ in opposite direction. The acceleration produced in it, is ........ $m/{\sec ^2}$
Give important factor to control the speed of vehicle in area of school or hospital.
If the velocity of a particle is given by $v = {(180 - 16x)^{1/2}} m/s$, then its acceleration will be.......$ms^{-2}$