an engine exerts a force
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P= (20i -3j +5k).(6i +20j -3k)= 120 -60 -15 J/s
P = 45 watt
A is the answer.
(Note : Dot product is scaler. )
Explanation:
POWER=FORCE ×VELOCITY
P=(20i-3j+5j).(6i+20j-3j)
= 120-60-15
=45 watt
mark as brainly