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3. A motorist traveling at 25 m/s passes a police car traveling at 10 m/s. The motorist does not change speed. The police car accelerates at 10 m/s2 at the instant it is passed. How long does it take to catch up with the speeder? ANSO 2.05 3. Acceleration due to Gravity (Objective 3) Read Text Sec. 7.3. Here the motion, while still in one dimension, may involve changes in direction.
Since we are dealing with vectors, we must be very careful with signs. It is often convenient to choose velocities and displacements to be positive when up and negative when motion is down. The acceleration due to gravity is always towards the earth and is therefore negative if the above sign convention is used. However, the symbol g represents the magnitude of gravitational acceleration, and hence g is always positive, that is, g = +9.8 m/s2.
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