1. A drag racing car starts at rest and accelerates for 4 seconds, reaching a top speed of 30 m/s. What is the car’s rate of acceleration?

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Presentation transcript:

1. A drag racing car starts at rest and accelerates for 4 seconds, reaching a top speed of 30 m/s. What is the car’s rate of acceleration?

Acc. = Fs – Is T Acc. = 30 m/s – 0 m/s 4s Acc. = 7.5 m/s2

A car is driving along the freeway at a speed of 12. 5 m/s A car is driving along the freeway at a speed of 12.5 m/s. In order to pass another car, it accelerates to a speed of 17.9 m/s, taking 5.5 seconds to do so. What is the car’s rate of acceleration?

Acc. = Fs – Is T Acc. = 17.9 m/s – 12.5 m/s 5.5s Acc. = 0.98 m/s2

3. John is driving in his car, traveling at a rate of 20 m/s 3. John is driving in his car, traveling at a rate of 20 m/s. He loses control and the car strikes a tree, coming to a complete stop in 0.15 seconds. What is the car’s rate of acceleration?

Acc. = Fs – Is T Acc. = 0 m/s – 20 m/s 0.15s Acc. = -133.33 m/s2

4. A jet airplane on an aircraft carrier is launched from one of the steam catapults, with an acceleration rate of 45 m/s2. What is the instantaneous speed of the aircraft at the end of the carrier deck, if it takes 4.3 seconds for the plane to reach the end?

Acc. = Fs – Is T 45 m/s2 = Fs – 0 m/s 4.3s Fs = 193.5 m/s

5. A skydiver jumps from an airplane 5. A skydiver jumps from an airplane. What is her instantaneous speed after 3 seconds? (gravitational acceleration is 9.8 m/s2)

Acc. = Fs – Is T 9.8 m/s2 = Fs – 0 m/s 3s Fs = 29.4 m/s