When a force of 1600 Newtons is applied to a spring suspended from the ceiling, it stretches 2 meters. A mass of 50 kg is connected to the end of the spring and it comes to rest at its equilibrium position. The mass is then set into motion by being pushed up from its equilibrium position with a velocity of 28 m/s. (Let the positive direction be downwards.) 1. Write the equation of motion that governs the mass-spring system described above.
2. Identify the initial conditions and solve the differential equation from part (a) with the given initial conditions.

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Anybody wanna ? (picture included? )