An inquisitive physics student and mountain climber climbs a 55.0-m-high cliff that overhangs a calm pool of water. He throws two stones vertically downward, 1.00 s apart, and observes that they cause a single splash. The first stone has an initial speed of 2.20 m/s. (a) How long after release of the first stone do the two stones hit the water? s (b) What initial velocity must the second stone have if the two stones are to hit the water simultaneously? magnitude  m/s direction     (c) What is the speed of each stone at the instant the two stones hit the water? first stone  m/s second stone m/s

Two 47. identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 30.0 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun B is fired straight downward. In the absence of air resistance, how long after pellet B hits the ground does pellet A hit the ground? 48. mmh An astronaut on a distant planet wants to determine its accel- eration due to gravity. The astronaut throws a rock straight up with a ve- locity of +15 m/s and measures a time of 20.0 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to gravity on this planet? I 52. A ball is thrown straight upward. At 4.00 m above its launch point, the ball's speed is one-half its launch speed. What maximum height above its launch point does the ball attain? 53. ssm From her bedroom window a girl drops a water-filled balloon to the ground,…

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A brick is thrown upward from the top of a building at an angle of 15° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 3.3 s, how tall is the building? m

A ball is dropped from rest from a height h above the ground. Another ball is thrown vertically upwards from the ground at the instant the first ball is released. Determine the speed of the second ball if the two balls are to meet at a height h/3 above the ground.

Near the end of a marathon race, the first two runners are separated by a distance of 45.0 m. The front runner has a velocity of 3.50 m/s, and the second a velocity of 4.20 m/s. (a) What is the velocity of the second runner relative to the first? m/s faster than the front runner. (b) If the front runner is 250 m from the finish line, who will win the race, assuming they run at constant velocity? The second runner will win. The first runner will win.     (c) What distance ahead will the winner be when she crosses the finish line? m

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Problem 1: Near the end of a foot race, the front two runners are separated by a distance of 45 m. The race leader has a velocity of 3.5 m/s and the second runner has a velocity of 4.2 m/s. a) What is the velocity of the second runner relative to the first? b) If the frontrunner is 250 m from the finish line, who wins the race? c) How far ahead of the second runner does the eventual winner finish?

A hot air balloon ascends straight up from the ground with a constant speed of 8.0 m/s. Three seconds later, a stone is shot straight up with an initial speed of 25 m/s. Determine, (a) the times when the balloon and the stone are at the same height. (b) the velocity (magnitude and direction) of the stone at both times.

1- Chapter 2- questn-39 A ball is thrown from the ground at a speed of 15 m/s, while another ball starts free fall from 35 meters at the same time. When they meet at the same height. Option 1 Option 2 Option 3 Option 4 Option 5 2.3s 2.5s 2.7s 2.9s 3.2s