1)Imagine a projectile traveling without any air friction. If we double its laun

Question

1)Imagine a projectile traveling without any air friction. If we double its launch velocity, by what factor will the distance it travels change?

one quarter

2) The range equation is only usefully accurate when:

3) In projectile motion without friction, the horizontal acceleration is:

A. four B. two C. it will not change D. one half E.

one quarter

2) The range equation is only usefully accurate when:

A. The force of air friction is larger than the force of gravity B. The force of air friction is equal to the force of gravity C. The force of air friction is always smaller than the force of gravity D. The force of gravity is absent

3) In projectile motion without friction, the horizontal acceleration is:

A. -9.8 m/s2 B. 9.8 m/s2 C. 0 m/s2 D. dependent on particle mass

Explanation / Answer

1) R = vo^2*sin(2*alf)/g

v' = 2vo

R = 4*vo^2*sin(2*alf)/g = 4 R

OPTION A

2) C.   The force of air friction is always smaller than the force of gravity

3) C.   0 m/s2

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