โจทย์ Physics SPTG พร้อมเฉลย

A force of 200 N is required to keep an object sliding at a constant speed of 2 m/s across a rough floor. How much power is being expended to maintain this motion?

A. 50 W
B. 100 W
C. 200 W
D. 400 W
E. Cannot be determined from the information given

Answer Key

Correct Answer: D

Explanation:

Using the equation P = Fv, we find that P = (200 N)(2 m/s) = 400 W.