A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to the victim with an initial velocity of 2.14 m/s and observes that it takes 2.4 s to reach the water. (a) List the knowns in this problem. (Select all that apply.) Ay (b) How high (in m) above the water was the preserver released? Note that the downdraft of the helicopter reduces the effects of air resistance on the falling life preserver, so that an acceleration equal to that of gravity is reasonable. m

A cargo helicopter, descending steadily at a speed of 4.5 m/s, releases a small package. Let upward be the positive direction for this problem. (a) If the package is 24 m above the ground when it is dropped, how long does it take for the package to reach the ground? (b) What is its velocity just before it lands? (Indicate the direction with the sign of your answer.)

I performed a lab using a toy car to go down a ramp that was positioned at different heights. For expample: ramp height = 60 cm, ramp length = 121.92 cm, time car took to clear the ramp from start = .67 seconds, distance car traveled from end of ramp to stopping point = 1178.56 cm, mass of car = .54 kg, based off this information..... Calculate the velocity of the car at the end of the ramp just before it starts its horizontal path to its stopping point. PE = KE = (1/2) m v^2

A soft tennis ball is dropped onto a hard floor from a height of 1.85 m and rebounds to a height of 1.41 m. (Assume that the positive direction is upward.) (a) Calculate its velocity just before it strikes the floor.(b) Calculate its velocity just after it leaves the floor on its way back up.(c) Calculate its acceleration during contact with the floor if that contact lasts 3.50 ms.(d) How much did the ball compress during its collision with the floor, assuming the floor is absolutely rigid?m

Consider a rock that is thrown off a bridge of height 68 m at an angle speed the rock is thrown is 15 m/s, find the following quantities. Vo Bridge 0 y (a) The time it takes the rock to reach its maximum height. S m (b) The maximum height reached by the rock. (c) The time at which the rock lands. S (d) The place where the rock lands. m m/s = (e) The velocity of the rock (magnitude and direction) just before it lands. magnitude direction O 21° with respect to the horizontal as shown in the figure below. If the initial

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A ball is thrown straight up with enough speed so that it is in the air for several seconds. (a) What is the velocity of the ball when it reaches its highest point?

Find the following values for path B in Figure 3.22. All blocks are 120 m on a side. Start Figure 3.22. (a) the total distance traveled X m (b) the magnitude and direction of the displacement from start to finish ON of E w/

A river has a steady speed of 0.500 m/s. A student swimsupstream a distance of 1.00 km and swims back to the startingpoint. If the student can swim at a speed of 1.20 m/s in stillwater, how long does the trip take? Compare this with the time thetrip would take if the water were still.

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 4.25 m/s. (a) What is the velocity of the second runner relative to the first? (Enter a number. Enter your answer in m/s faster than the front runner.) X 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 first runner will win. The second runner will win. (c) What distance (in m) ahead will the winner be when she crosses the finish line? (Enter a number.) X m