contestada

A ball is hit at an angle of 300. At what point in its trajectory does this

projectile have the least speed?

A. Just after it was launched.

B. At the highest point in its flight.

C. Just before it hits the ground.

D. Midway between the ground and the highest point.


A ball is thrown horizontally with a speed of 4.0 m/s from a height of 60.0

meters. What is the range of the projectile?

A. 4.00 m
B. 14.0 m
C. 24.0 m
D. 34.0 m


Which has constant velocity?
A.Range
B.Trajectory
C.Projectile
D.Vertical or Horizontal Velocity​

Respuesta :

The first one is D. Second one is A.

Answer:

C. At the highest point of flight.

Explanation:

Given data;

[tex]u_{x} = 4 m/s ,u_{y} = 0, h = 60 m[/tex]

Time of flight,

by third equation of motion ,

[tex]h=\frac{1}{2} gt^{2}[/tex]

[tex]t=\sqrt{\frac{2*60}{9.8} }[/tex]

[tex]t = 3.5 Sec[/tex]

so the range ,

by horizontal component of velocity,([tex]u_{x}[/tex])

R = 4X3.5

R = 14 m

Horizontal component of velocity remain constant in the entire motion.

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