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Question

A block of mass 1 kg is projected from the lowest point up along the inclined plane, if g=10 m/s2, the retardation experienced by the block is

  1. 152 m/s2
  2. 52 m/s2
  3. 102 m/s2
  4. zero


Solution

The correct option is A 152 m/s2

Let direction of acceleration in downward direction.
Retarding force will be the friction and gravitational force. So,
fs=μN=μmgcos450
fgravitational=mgsin450
By balancing the forces
ma=μmgcos450+mgsin450
a=(0.5×102+102)
a=152 m/s2

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