Answer to Question #185978 in Mechanics | Relativity for buddy

Question

How much power is exerted to lift a rock weighing 11.9 kg to a height of 1.23 m in 1.31 s?

Answer 1

Total force exerted by rock $=mg=11.9\times9.8=116.62\space N$

Total Displacement of rock, $s=1.23\space m$

Work Done $=Force\times Displacement=116.62\times1.23=143.44\space J$

Time, $t=1.31\space s$

Power $=\dfrac{Work \space Done}{Time}=\dfrac{143.44}{1.31}=109.49\space W$