# Question

A football is kicked off the flat ground at 25.0 m/s at an angle of 30o 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?

(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?

## Answer to relevant Questions

A railroad flatbed car is set up for a physics demonstration. It is set to roll horizontally on its straight rails at a constant speed of 12.0 m/s. On it is rigged a small launcher capable of launching a small lead ball ...A 75.0-kg person is standing on a scale in an elevator. What is the reading of the scale in newtons if the elevator is (a) At rest, (b) Moving up at a constant velocity of 2.00 m/s, and (c) Accelerating up at 2.00 m/s2? A 3000-kg truck tows a 1500-kg car by a chain. If the net forward force on the truck by the ground is 3200 N, (a) What is the acceleration of the car, and (b) What is the tension in the connecting chain? Consider a 2.0-kg ball and a 6.0-kg ball in free fall. (a) What is the net force acting on each? (b) What is the acceleration of each? Two blocks are connected by a light string and accelerated upward by a pulling force F. The mass of the upper block is 50.0 kg and that of the lower block is 100 kg. The upward acceleration of the system as a whole is 1.50 ...Post your question

0