A bullet of mass 20 g with a velocity of 500 m/s collides with a 1 kg block which is atrest on an inclined plane that makes an angle of 53◦ with the horizontal (the velocity of the bullet is parallel to the inclined plane). The velocity of the bullet decreases to 150 m/s after passing through the block. If the block stops after it has moved a distance 2 m (in the upward direction), find the friction coefficient µ between the block and the surface. (Take g = 10 m/s2 , cos 53◦ = 0.6 and sin 53◦ = 0.8.)

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