A girl of mass m1 = 60.0 kg springs from a trampoline with an initial upward velocity of vi = 8.00 m per second. At height h = 2.00 m above the trampoline, the girl grabs a box of mass m = 15.0 kg. For this problem, use g = 9.80 meters per second per second for the magnitude of the acceleration due to gravity. A) What is the speed vbefore of the girl immediately before she grabs the box?
B) What is the speed vafter of the girl immediately after she grabs the box?
C) What is the maximum height hmax that the girl (with box) reaches?

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

Which statement is best supported by the information in the chart? wave y is moving the fastest. wave x is moving the fastest. all of the waves are moving at the same speed. all of the waves have the same value of wavelengths per second.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.