I drive a bently how much minimum power can my engine give t

I drive a bently, how much minimum power can my engine give to a 1800 kg Bentley to double its speed in 6 seconds if it initially travels 65 m/s?

2# a 100 kg boat if pulled by a ship at a constant velocity of 12.6 km on a horizontal river surface. The coefficient of kinetic friction between the ship and the river is 0.30

what power should the ship deliver to pull the boat to make the trip in 35 min?

Solution

1.

From

V=V_o+at

2*65 =65+a*6

a =65/6 =10.83 m/s²

minimum power delivered by the engine is

P=FV =maV =1800*10.83*65

P=1.2675*10⁶ Watts