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1.
A mass of 6 kg is suspended by a rope of length 2 m from a ceiling. A force of 50 N is applied in the horizontal direction at the mid-point of the rope. The angel made by the rope, with the vertical, in equilibrium position will be (take 
neglect the mass of the rope)
neglect the mass of the rope)
2.
The average force necessary to stop a bullet of mass 
moving with a speed of 
, as it penetrates into the wood for a distance of 
is
moving with a speed of , as it penetrates into the wood for a distance of is
3.
A block 
is pushed momentarily along a horizontal surface with an initial velocity 
. If 
is the coefficient of sliding friction between and the surface, block will come to rest after a time
is pushed momentarily along a horizontal surface with an initial velocity . If is the coefficient of sliding friction between and the surface, block will come to rest after a time