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1.   A pony in a pony ride takes 44 seconds to make one circuit around a circle. The circumference of the circle is 132 m. What is the average speed of the pony in meters per second?

2.   A radio-controlled car is moving down a straight away on a track at a constant speed of 4.5 m/s. If the force applied by the drive system is 6 N, how great is the friction force applied to the car in the opposite direction?

3.   Mr. Bloop is testing his Super Mass-O-Matic Bouometer, a device for determining the mass of an object by immersing it in play dough and measuring the buoyancy. On his first test he determines the mass of an apple to be five million grams. It seems a little high. He makes some adjustments and comes up with a new measurement of 871,500 grams. What was the difference in his measurements of the mass of the apple?

4.   The efficiency of a compound machine consisting of gears, screws and levers is found to be 60%. Unfortunately the machine was left out in the rain for a week and some corrosion of the metal parts occurred. If the machine's efficiency decreased by 30%, what is its efficiency after the corrosion occurred?

5.   Sean's go-kart travels at a maximum speed of 33 kilometers per hour. How far can it go in 20 seconds? Round your answer to the nearest hundredth.

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Middle School Math
Math Worksheets