College Physics with MasteringPhysics 7th Edition by Jerry Wilson,Anthony Buffa,Bo Lou

Exercise 96

A football is kicked off the flat ground at 25.0 m/s at an angle of 30° relative to the ground. (a) Determine the total time it is in the air. (b) Find the angle of its velocity with respect to the ground after it has been in the air for one-fourth of this time. (c) Repeat for one-half and three- fourths of the total time. (d) For each of these times, determine its speed. Comment on the speed changes as it follows its parabolic arc. Do they make sense physically