Question

A high-speed boat has four 325.0 kW motors. How much work is done in 25 seconds by the motors?

a.) 8,125 J
b.) 8.125 MJ
c.) 325,000 J
d.) 32.5 MJ

Answer 1

Option D

Step-by-step explanation:

Power is given by as work done per unit time and expressed as

P=W/t

Where W is work done, t is time and P is power.

Making W the subject of formula then

W=Pt

Substituting P by 4*325000 since they are four motors and taking 25 s dor t

W=4*325000*24=32,500,000 J

This is equivalent to 32.5 MJ hence option D is correct