Laws of MotionHard
Question
A block of mass 3kg is pulled up on a smooth incline of angle 37o with the horizontal. If the block moves with an acceleration of 2m/sec2, then the power delivered by the pulling force at t = 5sec after the start of motion -
Options
A.120 W
B.240 W
C.60 W
D.480 W
Solution
F - mg sin 37o = ma
F = mgsin37o + ma = 3 × 10 ×
+ 3 × 2 = 24v = u + at = 0 + 2 × 5 = 10
P = Fv = 240 watt
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