In World War Il, there were several reported cases of airmen who jumped from their flaming airplanes with no parachute to escape certain death. Some fell about 20,000 feet (6000 m), and some of them survived, with few life-threatening injuries. For these lucky pilots, the tree branches and snow drifts on the ground allowed their deceleration to be relatively small. If we assume that a pilot's speed upon impact was 123 mph (54 m/s), then what was his deceleration? Assume that the trees and snow stopped him over a distance of 3.0 m.

A skier starts from rest and slides downhill. What will be the speed of the skier if he drops 35 centimeters in vertical height? Ignore any air resistance ( which will in reality be quite a lot) and any friction between the skis and the snow

A 10-m-long glider with a mass of 680kg (including the passengers) is gliding horizontally through the air at 24 m/swhen a 60kg skydiver drops out by releasing his grip on the glider.

Two planes, A and B, are flying at the same altitude. Their velocities are v₁ = 500 km/h and VB = 670 km/h such that the angle between their straightline courses is = 60°. (Figure 1) B VA - 500 km/h Determine the magnitude of the velocity of plane B with respect to plane A. Express your answer in kilometers per hour to three significant figures. Determine the direction angle of the velocity of plane B with respect to plane A, measured counterclockwise from the positive x axis. Express your answer in degrees to three significant figures.

A collision occurred between a 1540 kg automobile (A) struck a stopped 890 kg automobile (B). All of the wheels of B were locked, and it slid 6 m after the impact. The coefficient of kinetic friction between B's tires and road was estimated to be u k = 0.8 and the coefficient of restitution of the impact to be e = 0.2. Determine automobile A's velocity in meters per second, just before the impact? Note: You can assume that there was a single impact. VA A B

Starting from rest, a bullet train acquires a velocity of 200 km/h during 20 seconds. What is the acceleration of the bullet train in m/s2?