A 1500kg vehicle has its velocity reduced from 20m/s to 15m/s in 3.0 seconds. How large was the average retarding force?
Correct answer: C. -2500N
- A. -500 N
- B. -1500N
- C. -2500N
- D. -3500 N
Explanation
Using the formula; Average force = mass × change in velocity / time F = ma = mass × change in velocity / time Average force = 1500 × 9(15 - 20) / 3 = -2500N The negative sign indicates that the force act opposite to the directon of motion.Therefore, the average retarding force is -2500 N.
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