Chapter 4 – Work, Energy and Power

Three blocks A, B and C are lying on a smooth horizontal surface, as shown in the figure. A and B have equal masses, m while C has mass M. Block A is given an initial speed v towards B due to which it collides with B perfectly inelastically. The combined mass collides with C, [...]

A man mass = 50 kg and his son mass =20 kg are standing on a frictionless surface facing each other. The man pushes his son so that he starts moving at a speed of 0.70 ms^–1 with respect to the man. The speed of the man with respect to the surface is : A [...]

Two particles of masses M and 2M moving as shown with speeds of 10 m/s and 5 m/s collide elastically at the origin. After the collision they move along the indicated directions with speeds v1 and v2 respectively are nearly : A body of mass m=10−2kg is moving in a medium and experiences a frictional [...]

A particle of mass m is moving with speed 2v and collides with a mass 2m moving with speed v in the same direction. After collision the first mass is stopped completely while the second one splits into two particles each of mass m which move at angle 45^° with respect to the original direction. [...]

A body of mass m1 ​moving with an unknown velocity of v1i ^, undergoes a collinear collision with a body of mass m2 ​ moving with a velocity v2 i ^. After collision, m1 and m2 move with velocities of v3 i ^ and v 4i ^ , respectively. If m2 =0.5 m1 and v [...]

A particle moves in one dimension from rest under the influence of a force that varies with the distance travelled by the particle as shown in the figure. The kinetic energy (in J) of the particle after it has travelled 3 m is A body of mass m=10−2kg is moving in a medium and experiences [...]