Explain :

Dear Student,

Figure for indicative purpose only; not to scale.

initial velocity =0, frictional force =0.  

Let Pullng force = F. Acceleration = a = 1 m/s²

Along the incline :

F = mg sin 30 + ma

   = 9.8 + 2 = 11.8 N

 

let v = velocity after 4 seconds

v = at = 4 m/s      

 

s = distance in 4 seconds

   = 1/2 at² = 8 m.

 

Power at t=4 s

P = F . v = 11.8 * 4 = 47.2 W

 

Work done in 4 seconds = W = F * s = 11.8 * 8

Average power = Pa = W/t = 23.6 W

We hope that clarifies your query.
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