Imagine a roller coaster, with an initial speed of 5m/s downhill, descends 20m in height. now suppose the roller coaster, with an initial speed of 5m/s uphill, coasts uphill, stops, and then rolls back down to a final point 20m below the starting point. would the final speed be the same in these two cases? assume friction is negligible.

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

Ajet plane has a sound level of 120 db at a distance of 60 m. what is the q23. sound level at a distance of 6.0 km? (60)2 (6000)? om solution 80db db, hint: 16x assume ultrasound waves travel through the body of an animal at 1540 q24. m/s. if a 30,000 hz signal were reflected off a portion of a heart which was moving toward the source at 3 m/s, what frequency signal would return to the stationary source? solution 30.117hz

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?