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| 1. |
A car is traveling in a straight line along a highway at a speed of 20 m//s. The driver steps on the gas pedal, and 3 seconds later, the car's speed is 32 m//s. Find its average acceleration. |
| Answer» Solution :Assuming that the DIRECTION of the velocity doesn't change, its's simply a matter of dividing the change in velocity `(32 m//s- 20 m//s= 12 m//s)` by the time INTERVAL during which the change OCCURRED : `overline(a)= Delta v // Delta t = (12 m//s) // (3 s)= 4 m//s^(2)`. | |