A projectile is launched from level ground at an angle above the horizon where 0

Question

A projectile is launched from level ground at an angle above the horizon where 0 is between 0° and 900. 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 n 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

for a projectile

inital velcoity (v) given at certain angle (Theta) will resovle

into two Components

horizontal Component Vx = V cos theta

vertical component Vy = V sin Theta

a)

During its flight, these componets change as

Vy becomes zero at its highest point

vertical Component is zero at the highest point

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b) horizonatal accleration ax = 0

while vertical accleration ay = - g

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c. after the time of flight, speedin minimum

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d. speed is maximum at an intial point i.e point ogf projection
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e. yes, when it reaches the same point on the line as that of point of projection, its velocity if same

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d) yes, while falling down from maximum height, both velcity and accleration are in same direction

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e) yes while moving upwards, v and a are opposites to each other

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f) yes, through out the motion, speed remains constant

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