In a lab investigation one group of students (group a) measures the speed of 0.1 kg toy car to be 2.5 m/s at the bottom of a ramp. another group of students (group b) measures the speed of the car to be 4 m/s at the bottom of the ramp. The car's starting position at the top of the ramp is 1m high. A. what is the potential energy of the car at the beginning of the experiment before its speed is measured

B. Calculate the kinetic energy of the car for group A.

C. Calculate the kinetic energy of the car for group B.

1. what is the relationship between wavelength and the penetrating power of an electromagnetic wave? a) the penetrating power has no relationship to the wavelength. b) the penetrating power increases as the wavelength increases. c) the penetrating power decreases as the wavelength increases. d) the penetrating power decreases as the wavelength decreases. 2. as ice melts and turns into water, the speed of sound through the material would most likely do what? justify your answer. a) the speed would not change because the material is always water. b) the speed of sound would increase because the density of water is less than that of ice. c) the speed of sound would increase because energy is added to ice in order to make it melt. d) the speed of sound would decrease because sound travels faster through solids than liquids. 3.which of these waves need a medium to travel through? a) sound b) x-rays c) infrared rays d) visible light