A car traveling 75 km/h slows down at a constant acceleration of 0.50 m/s^2 just by “letting up on the gas.” Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stop.
1. A car traveling 75 km/h slows down at a constant acceleration of 0.50 m/s^2 just by “letting up on the gas.” Calculate (a) the distance the car coasts before it stops, (b) the time it takes to stop.
2. A horse trots away from its trainer in a straight line, moving 38 m away in 9.0 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate (a) its average speed and (b) its average velocity for the entire trip, using “away from the trainer” as the positive direction.
3. At highway speeds, a particular automobile is capable of an acceleration of about 1.8 m/s^2. At this rate, how long does it take to accelerate from 65 km/h to 120 km/h?
4. In coming to a stop, a car leaves skid marks 65 m long on the highway. Assuming a deceleration of 4.00 m/s^2, estimate the speed of the car just before breaking.
5. A baseball is hit almost straight up into the air with a speed of 25 m/s. Estimate (a) how high it goes, (b) how long it is in the air.
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