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Chapter 2: Problem 65
A falling object travels one-fourth of its total distance in the last second of its fall. From what height was it dropped?
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A giant eruption on the Sun propels solar material from rest to \(450 \mathrm{km} / \mathrm{s}\) over a period of \(1 \mathrm{h} .\) Find the average acceleration.
A car moving initially at \(50 \mathrm{mi} / \mathrm{h}\) begins slowing at a constant rate \(100 \mathrm{ft}\) short of a stoplight. If the car comes to a full stop just at the light, what is the magnitude of its acceleration?
What's the conversion factor from meters per second to miles per hour?
You're atop a building of height \(h,\) and a friend is poised to drop a ball from a window at \(h / 2 .\) Find an expression for the speed at which you should simultaneously throw a ball downward, so the two hit the ground at the same time.
A motorist suddenly notices a stalled car and slams on the brakes, negatively accelerating at \(6.3 \mathrm{m} / \mathrm{s}^{2} .\) Unfortunately, this isn't enough, and a collision ensues. From the damage sustained, police estimate that the car was going \(18 \mathrm{km} / \mathrm{h}\) at the time of the collision. They also measure skid marks 34 m long. (a) How fast was the motorist going when the brakes were first applied? (b) How much time elapsed from the initial braking to the collision?
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