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General
Easy
Question
A long plank P of the mass 5 kg is placed on a smooth floor. On P is placed a block Q of mass 2 kg. The coefficient of friction between P and Q is 0.5. If a horizontal force 15N is applied to Q, as shown, and you may take g as 10N/kg.
- The reaction force on Q due to P is 10N
- The acceleration of Q relative to P is 2.5 m/s2
- The acceleration of P relative to the Floor is 2.0 m/s2
- The acceleration of centre of mass of P + Q system relative to the floor is (15/7)m/s2
The correct answer is: The acceleration of P relative to the Floor is 2.0 m/s2
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