An 800 kg police boat slows down uniformly from 50 km/h [E] to 20 km/h [E] as it enters a harbour. If the boat slows down over a 30 m distance, what is the force of friction on the boat? (Hint: You will need to convert the velocities into m/s.)

Answer 1

To go from km/h to m/s divide by 3.6 which is 1000 m/km / 3600 s/min

a = change in velocity/time (note it is negative)

F = m a

By the way, this ignores wave resistance which would be a major part of the retarding force.

Answer 2

Damon. can you answer in detail. I already converted. what do I do next.

Answer 3

Well you're just Incompetent