## Motion in a vertical circle and conservation of energy

A stone  tied to a string of length l is whirled around a vertical circle with the other end of the string at the centre. At a certain instant of time the stone is at the lowest position and has a

## A Numerical Problem from Projectile Motion

A short is fired from a gun on the top of a hill 90m high with velocity 80m/s at an angle of 30 degree with the horizontal. Find the horizontal distance between the vertical line through the gun and

## An MCQ from Projectile motion

Devender posted this question: A plane is flying horizontally at 98m/s and releases an object, which reaches the ground in 10s. the angle made by it while hitting the ground is

(a) 55 degree
(b)

## A bullet of mass 20g enters into a fixed block with aspeed 40m/s and stops in it. find the change in internal energy during the process.

A bullet of mass 20 g enters into a fixed block with a speed 40m/s and stops in it.
find the change in internal energy during the process?