Why does Michael Jordan appear to defy gravity as he slam dunks the ball? (After

Question

Why does Michael Jordan appear to defy gravity as he slam dunks the ball? (After you have thought about this question, see page 68 of your textbook.)

His horizontal motion keeps him above the ground.

Which of the following could happen if there were no air resistance and no gravity?

A. An object thrown at an angle upward would come down, but more slowly than it does on Earth.

b. An object thrown at an angle upward would keep going up in the same direction for ever and never come down.     

C. An object thrown at an angle upward would come down the same way it does on Earth.

D. An object thrown at an angle upward would slow down and stop.

E. An object thrown at an angle upward would eventually change direction to move at constant height, rather than up.

A 3 kg toy car with a speed of 7 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 2 m/s. If the cars are locked together after the collision with a speed of 3.40 m/s, how much kinetic energy is lost? ____J

A. He is an extraordinary athlete who is able to jump much higher than most humans. B.

His horizontal motion keeps him above the ground.

C. His motion is that of a projectile, and a projectile's motion is such that its vertical speed is minimal while at the high point of its trajectory.

Explanation / Answer

a) His motion is that of a projectile, and a projectile's motion is such that its vertical speed is minimal while at the high point of its trajectory.

b) An object thrown at an angle upward would keep going up in the same direction for ever and never come down.

c) Loss = initial - final KE = 0.5*3*7*7 + 0.5*2*2*2 - 0.5*5*3.4*3.4 = 48.6 J Answer

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