Since sound travels faster in warm air, the speed of sound near the ground is increased, leading to a gradual reflection of sound waves.
true or false?

Compare the horizontal displacement of the two balls as they travel to the ground. what do you observe?

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?