A block of mass 5 kg starting from rest pulled up on a smooth incline plane making an angle of 30∘ with horizontal with an affective acceleration of  1 ms−2. What is the power delivered by the pulling force at  t = 10 s from the start? Answer: Pathway that lead to answer 50 W 1. Power = Force x Velocity 2. V = u + at = 0 + (10 × 1) = 10 m/s 3. F = ma = 5 × 1 = 5 - Step with Mistake 4. Power = 50 Pathway that lead to answer 25 W 1. P = W / t 2. W = F s 3. s = ut + 1/2at^2 = 50 4. F = ma = 5 5. W = 250 6. P = 25 W