Newtons Laws Of Motion

A body of mass is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure :

If the unit of force and length be each increased by four times, then the unit of energy is increased by

A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses and . Taking , find the work done (in joules) by the string on the block of mass during the first second after the system is released from rest.

Block of mass and block of mass are placed on a fixed triangular wedge by means of a massless, inextensible string and a frictionless pulley as shown in figure. The wedge is inclined at to the horizontal on both the sides. If the coefficient of friction between the block and the wedge is and that between the block and the wedge is and both the blocks and are released from rest, the acceleration of will be

A body of mass hits normally a rigid wall with velocity and bounces back with the same velocity. The impulse experienced by the body is