Author Question: Which of the following statement is not true about projectile motion? (Read 1550 times)

Hawke · **on:** Jun 23, 2013

CHOICES:
a. Horizotal velocity of a projectile is constant
b. It is a combination of two independent motions- vertical and horizontal
c. The motion of the projectile released downward is accelerated
d. Both horizontal and vertical velocities are constant

If you have an answer please state the reason.
Thanks!

Sandstorm · **Reply #1 on:** Jun 23, 2013

d. is wrong
horizontal velocity is always constant
vertical velocity is always not constant

the constant in vertical motion is the acceleration of gravity
but not the vertical velocity

camila · **Reply #2 on:** Jun 23, 2013

d.Both horizontal and vertical velocities are constant is the wrong statement about projectile motion.

Sandstorm · **Reply #3 on:** Jun 23, 2013

Sorry, but I think it depends on the environment in which the experiment is performed.

Usually, answer D would be false.

;-D Out is space, maybe D could be true.

Jesse_J · **Reply #4 on:** Jun 23, 2013

d; vertical motion is accelerated thus velocity changes

Jones · **Reply #5 on:** Jun 23, 2013

A&D
Neither the horizontal or the vertical velocities are constant.
The vertical is increased by the force of gravity.
The horizontal is decreased by air resistance.
But the path of the projectile is a combination of the two.