With what speed in miles/hr (1m/s. 2.23 mi/hr) must an object be thrown to reach a height of 91m (equivalent to one football field)? Assume negligible air resistance.
(a) 53 m/s, 6 mi/hr (b) 42.3 m/s, 94.4 m

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

Could we see a galaxy that is 20 billion light-years away?

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.