Aroller coaster has a mass of 250 kg. it drops from rest at the top of a hill that's 88 m tall. how fast is it going when it reaches the bottom? acceleration due to gravity is g = 9.8 m/s2.
a.41.5 m/s b.13.1 m/s c.52.2 m/s d.70.0 m/s

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.