Question

I need help with the second part of this question. Please show work so I can see. Thanks.

I. The fastest land mammal, the cheetah, can accelerate from 0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec. I got 23.3 for my answer.

The Lamborghini Diablo sports car accelerates from 0.0 km/hr to 99.2 km/hr in 4.0 seconds. What is the acceleration of this car? Give your answer in units of kilometers per hour/sec. 7.
I got 24.8 kph/s as the answer for the above.

II. Which has a greater acceleration, the cheetah or the Lamborghini Diablo? (To figure this out, you must remember that there are 1.6 km in one mile) Be sure to show your calculations

Answer 1

You gave your answer in miph/s. The
problem says "give your answer in mph/s". Which one is correct?

1. a = (V-Vo)/t = (70-0)/3=23.3 miph/s.

a = (99.2-0)/4 = 24.8 kmph/s.

2. a = 23.3miph/s * 1.6km/mi = 37.3 kmph/s. = acceleration of the cheetah.

a = 24.8 kmph/s = acceleration of the
sports car.

Winner: The cheetah!!