Recent content by reggie

A ball of mass 0.2 kg is thrown vertically upwards with a speed of 30m per second. It can just reach a height of 10m. 1 . calculate the total loss in mechanical energy when ball reach the highest point. 2. Find the average air resistance opposing the motion of the ball.

A trolley of mass 1.5 kg is released from rest at A and moves along a smooth track, as shown in the figure. 1. As the trolley moves along the smooth track, the track exerts a force on it. Would this force do work on the trolley? 2. Where will the trolley have the...

Two blocks are connect by a lght string which passes over a light pulley as shown in the figure. They are released from rest. Block A distance of 1.2m in 1.6 s http://img149.exs.cx/img149/3595/pulley5uz.th.jpg 1. what is the gain in the kinetic energy of the two blocks? 2.What is the loss...

In police practice, bullets od identical mass are fired towards a concrete qall at different speed. It is found that a bullet traveling horizontally at 200m per second can penetrate the wall by a distance of 01.m. 1.In penetrating the wall, the kinetic energy of the bullet decreases. Account...