1)What is the speed of a projectile at landing after a launch from some height ?

Question

1)What is the speed of a projectile at landing after a launch from some height ?

A.Exactly the launching speed

B.Greater than the launching speed

C.Depends on the launching angle

D.lesser than launching speed

2)From your horizontal launch data you suppose to plot a graph "Distance squared" vs. "Height" in order to estimate launching speed from the slope of this line. If you plotted a graph "Height" vs. "Distance squared" and defined its slope "S", what formula should you use to compute launching speed ?

A.sqrt(g/2/S)

B.sqrt(2*g/S)

C.sqrt(2*S/g)

D.sqrt(2/g/S)

E.sqrt(S/2/g)

3)When two projectiles launched at the same speed will have absolutely identical trajectories ?

Explanation / Answer

1)

at some height after launching , as gravity is oposite to the motion ,

D.lesser than launching speed

2)

incomplete informatiom

3)

No, they will have identical trajectories only if they have same angle of

launch and same speed

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