Questions in Laws of Motion

Select	Question
	300 Joule of work is done in sliding up a 2 kg block on an inclined plane to a height of 10 metres. Taking value of acceleration due to gravity ‘g’ to be 10 m/s2, work done against friction is
	A 2 kg mass starts from rest on an inclined smooth surface with inclination 30o and length 2 m. How much will it travel before coming to rest on a frictional surface with frictional coefficient of 0.25
	A block rests on a rough inclined plane making an angle of ${30^o}$ with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of the block (in kg) is (take $g = 10\,\,m/{s^2})$
	A body takes time t to reach the bottom of an inclined plane of angle $\theta$ with the horizontal. If the plane is made rough, time taken now is 2t. The coefficient of friction of the rough surface is
	A block is kept on an inclined plane of inclination $\theta$ of length l. The velocity of particle at the bottom of inclined is (the coefficient of friction is $\mu$)