Question

2.
An automobile weighing 1200 kg climbs up a hill that rises 1m in 20s. Neglecting frictional effects,
the minimum power developed by the engine is 9000 W. If g = 10 ms, then the velocity of the
automobile is
(a) 36 kmh
(b) 54 kmh (c) 72 kmh
(d) 90 kmh​

Answer 1

Answer:

(c) 72kmh

we know that

v^2=u^2+2gh