Acceleration Problems

Mark slams on the brakes after traveling 25 m/s. It takes him 3 seconds to come to a complete stop. What is his acceleration?

• 8.33 m/s²

• -8.33 m/s²

• 75 m/s²

• -75 m/s²

A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.

• 2.2m/s²
• 7.0m/s²
• 5.7m/s²
• 70m/s²

A bicyclist begins moving with a velocity of 10 m/s and then decreases his velocity to 6 m/s in 2 seconds. What is the acceleration of the bicyclist?

• 4 m/s²
• -4 m/s²
• 2 m/s²
• -2 m/s²

A dog runs with an initial speed of 7.5 m/s on a waxed floor.  It slides to a stop in 15 seconds.  What is the acceleration?

• -7.5 m/s
• -7.5 m/s²
• -0.5 m/s²
• 7.5 mi//hr

What is the motion shown in this velocity time graph?

• moving with a constant positive velocity

• Speeding up in the positive direction

• slowing down in the positive direction

• speeding up in the negative direction

What is the motion shown in this velocity time graph?

• moving with a constant positive velocity

• Speeding up in the positive direction

• slowing down in the positive direction

• speeding up in the negative direction

Kaya is riding her dirt bike eastward on a dirt road. She spots a pothole ahead. Kaya slows her car from 14.0 m/s to 5.5 m/s in 6.0 s. What is her acceleration?

• -1.4 m/s²

• + 1.4 m/s²

• 0.7 m/s²

• 14.5 m/s²