Multiple choice

To cover a distance of 315 km in 2.8 hours, what should be the speed of the car in meters/second?

  1. 112.5 m/s

  2. 56.25 m/s

  3. 62.5 m/s

  4. 31.25 m/s
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D Correct answer
Explanation

Speed = Distance / Time = 315 km / 2.8 hours = 112.5 km/h. To convert to m/s, multiply by (5/18). 112.5 * (5/18) = 31.25 m/s.

AI explanation

First, find the speed in kilometers per hour using the formula speed equals distance divided by time, which gives 315 km divided by 2.8 hours to equal 112.5 km/h. To convert this speed to meters per second, multiply by 5 divided by 18. The calculation is 112.5 multiplied by 5 and then divided by 18, which gives 31.25. The required speed of the car is 31.25 m/s.

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