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In case of elastic collision, at the time of impact.

The ball is projected up from ground with speed 30 m/sec. What is the average velocity for time 0 to 4 sec?

Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel, the motion of the particle is

A body of mass 0.5 \(kg\) is projected under gravity with a speed of 98 \(m/s\) at an angle of 30° with the horizontal. The change in momentum (in magnitude) of the body is

Motion of an oscillating liquid column in a U-tube is