1.  Kayla dropped rock 1 (mass =1.7kg) from a height of14meters. She then dropped rock 2 (mass =3.6kg) from the same height. What was the ratio of kinetic energies of the rocks (KE_{rock1}/KE_{rock2}) when they hit the ground? (note: the acceleration of gravity is 9.81 m/s^{2}.)

 2.  On planet X, the atmospheric pressure is lower than it is on planet Y. Interplanetary probes were recently sent to the two planets and data were obtained on many things including the atmospheric pressure. The pressure on planet Y is17N/m^{2}. If the pressure on planet X isun terzothat of planet Y, what is the pressure, in Pascals, on planet X? Round your answer to the nearest hundredth if necessary.


3.  Space ship Z is traveling at182,000miles per second. Spaceship Q is traveling at173,000miles per second. What is the ratio of speeds (Z/Q) of the two spaceships? Express your answer in terms of the maximum speed of light, which is186,000miles per second.

 4.  Mackenzie is trying a new fuel formula in her gokart. In her first trial, fuel mixture A resulted in a maximum speed of30miles per hour on a flat smooth road. On the same road, mixture B resulted in a maximum speed of60miles per hour. Mixture B appears to increase the maximum speed of the gokart by what factor? Express your answer as a ratio of speeds.


5.  Christopher calculated the mass of a toy car to be29.6grams. Samuel calculated the mass of the same car but made an error and obtained a mass that was greater than Christopher's by a ratio of5to3. What was Samuel's calculation for the mass of the car?

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