A400-lb object is released from rest 500-ft above the ground and falls under the influence of gravity. assume the force in pounds due to air resistance is  where  is the velocity of the object in ft/sec, determine the equation of motion of the object. when will the object hit the ground and what is its velocity at the impact

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Wavelength, frequency, and energy are related. what happens to a wave as it’s wavelength gets shorter?

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.