1. a. An object is undergoing free fall motion. As it falls, the objects -Speed

Question

1.

a. An object is undergoing free fall motion. As it falls, the objects

-Speed increases

-Acceleration increases

-Both of these

None of these

B. A projectile is launched at an angle of 15 degress aove the horizontal and lands down the range. For the same speed, what other projection angle would produce the same range?

-30 degrees

-45 degrees

-50 degrees

-75 degrees

-90 degrees

C. A football is kicked into the air at an angle 45 degrees with the horizontal. At the very top of the balls path. its velocity is?(Neglect the effects of air resistance.

-Entirely Vertical

-Entirely Horizontal

-Both Vertical and Horizontal

-Not enough information give

Explanation / Answer

A)

As an object free-falls, its velocity changes by approximately 10 m/s every second. This means that the acceleration is a constant value of 10 m/s^2.

so speed increases

B)

For projectiles launched at angles, a launch angle of 45 degrees will provide the largest horizontal displacement. Any two launch angles which are separated from 45 degrees by the same amount will provide the same horizontal displacement.

sin 2 theta = sin ( pi - 2 theta) = sin 2 ( pi/2- theta)

15 degree and 90-15 = 75 degree

so 75 degree will give same range

(C)

As a projectile rises towards its peak, its horizontal velocity remains constant while its vertical velocity decreases. At its peak, its vertical velocity becomes 0 m/s. At this instant in time, the velocity is entirely horizontal; there is no vertical component to the velocity.

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