Change in velocity Can be change in speed or direction Acceleration = V/ T V at
A roller coasters velocity at the top of a hill is 10m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26m/s. What is the acceleration of the roller coaster?
Acceleration = V/ T a = 26m/s – 10m/s 2 s a = 16m/s 2s a = 8m/s/s or 8m/s 2
Negative acceleration Example: A car slows from 60mi/hr to 20mi/hr in 4 seconds. What is its acceleration? Acceleration = V/ T Acceleration = Vf – Vi t a = 20mi/hr – 60mi/hr 4 s a = -40mi/hr 4s a = -10mi/hr/s