Answer:
41800 W=41.8kW
Step-by-step explanation:
Power is work done per unit time
P=W/t
Where P is powe, W is work done and t is time
Work done is given by change in kinetic energy
Change in kinetic energy , ∆KE=½m(v²-u²)
Where m is the mass, v is final velocity and u is initial velocity.
Substituting 1200 kg for m, 15 m/s for v and 4 m/s for u then
∆KE=½*1200*(15²-4²)=125, 400J
W=∆KE=125, 400J
Substituting 3 s dor t and 125400 for W
Power=W/t=125400/3=41, 800 W
Therefore, power is 41800 W or 41.8 kW