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Mock drill.

Allotrope of carbon used in cutting glass and rock drilling.

A batsman hits a sixes and the ball touches the ground outside the cricket ground. Which of the following graph describes the variation of the cricket ball's vertical velocity v with time between the time t_1 as it hits the bat and time t_2 when it touches the ground?

A batsman hits a cricket ball which then rolls on a level ground . After covering a short distance, the ball comes to rest, The ball slows to a stop because

An electric grinding wheel rotates for sometime after the power is turned off, but an electric drilling machine stops after few seconds of turning of fthe power.Why?

An electric grinding wheel rotates for sometime after the power is turned off, but an electric drilling machine stops after few seconds of turning of fthe power.Why?

Describe a seed -drill.