– [Narrator] Let’s use energy conservation to solve a couple of problems. Here’s the first one. A cricket ball is thrown vertically up with a speed of 20 meters per second from ground. Find the speed of the ball when it has reached a height of 15 meters. Given g is 10 meters per second […]

dear students, let us study law of conservation of momentum now as we have already studied in the previous chapter , about system of particles, for a system of particle we have studied that velocity of centre of mass , of a system of particle can be given by , total momentum of system divided […]

in this example we are given that a ball with a speed 9 meters per sec strikes, another identical ball at rest such that after collision, the direction of each ball makes an angle 30 degree with the original line of motion, and here we are required to find the speed of the two balls […]

Hi. This week’s lab is on exploring the mechanical energy of a volleyball as it gets tossed or bounced. Of course, you know something about the conservation of energy, where the kinetic energy as you throw something up changes into gravitational potential energy and changes back to kinetic on the way down so then you […]

this example says that a figure shows a spring block system , on which time varying force , 5 t is applied on two k g mass, and after ten sec velocity of three k g mass is observed to be thirty meters per sec, we are required to find velocity of two k g […]

in this example, we are given that a bullet of mass five k g is fired toward a twenty k g block at speed thirty meters per second , which is placed on smooth ground . it is observed that the bullet penetrates the block, and comes out at a speed of ten meters per […]

in this example we are given, a triangular fixed wedge of height h, and angle of inclination theta , and is given that a block-a , which is also given is of mass m , is released from rest top of the a wedge block of height h, as shown in figure , if velocity […]