A projectile is launched from level ground at an angle above the horizon where i

Question

A projectile is launched from level ground at an angle above the horizon where
is between 0° and 90°. Assume that air resistance can be neglected. Explain the
reasoning for your answers. (a) During the time the projectile is in flight is the
velocity ever zero? (b) Is the acceleration ever zero? (c) When, if ever, is the
speed of the projectile a minimum? (d) When, if ever, is the speed a maximum?
(e) During flight can the velocity ever be the same as the initial velocity? If so,
when? (d) Is the acceleration ever in the same direction as the velocity? (e) Is the
acceleration ever in the opposite direction from the velocity? (f) During flight
can the speed ever be the same as the initial speed? If so, when?

Explanation / Answer

(a) The velocity of the projectile never zero.

(b) The acceleration is never zero during the projectile motion.

(c) The speed of the projectile is minimum when it is at the highest point in the flight.

(d) The speed is maximum at the beginning and the end of the flight.

(e) No, the velocity can never be the same as the initial velocity.

(f) The acceleration vector is never in the same direction as the velocity vector.

(g) The acceleration vector is never in the opposite direction from the velocity vector.

(h) At the end of the flight, the speed of the projectile is the same as the initial speed.

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