A force `F` is applied to a dumbbell for a time interval, `t` as in `(i)` and then as in `(ii)`. In which case does the dumbbell acquire the greater centre-of -mass speed ?
.

A uniform rod of mass m and length l is struck at an end by a force F perpendicular to the rod for a short time interval t. Calculate a. the speed of the centre of mass ,b. the angular speed of the rod about centre of mass, c. the kinetic energy of the rod and d. the angular moment of the rod about the centre of mass after the force has stopped to act. Assume that t is so small that the rod does not apreciably change its direction while the force acts.

A uniform rod of mass m and length l is struck at an end by a force F perpendicular to the rod for a short time interval t. Calculate a. the speed of the centre of mass ,b. the angular speed of the rod about centre of mass, c. the kinetic energy of the rod and d. the angular moment of the rod about the centre of mass after the force has stopped to act. Assume that t is so small that the rod does not apreciably change its direction while the force acts.

A force F= 2t^2 is applied to the cart initially at rest. The speed of the cart at t = 5 s is -

A force of 75 N is applied to a block of mass 25 kg, resting on a smooth horizontal surface. In how much time, the block will acquire a speed of 12 m/s?

Assertion: A constant force F is applied on two blocks and one spring system as shown in figure. Velocity of centre of mass increases linearly with time. Reason: Acceleration of centre of mass is constant.

Assertion: A constant force F is applied on two blocks and one spring system as shown in figure. Velocity of centre of mass increases linearly with time. Reason: Acceleration of centre of mass is constant.

A force F= 2t^2 is applied to the cart of mass 10 Kg, initially at rest. The speed of the cart at t = 5 s is -

A force F is applied to the initially, stationary cart. The variation of force with time is shown in the figure. The speed of cart at t = 5 s is