Question

A 1,200 kg car ascends a road inclined at 20⁰ to the horizontal at 25 km/h. Neglecting frictional opposition, estimate the power required to keep going at this speed.

Answer 1

power required to keep going:

$P=m\vec{g}\cdot \vec{v}=mgvsin\alpha=1200\cdot 9.8\cdot25sin20\degree/3.6=27932$ W