A rock is thrown off a cliff in the horizontal direction at a speed of 2.4 m/s.

Question

A rock is thrown off a cliff in the horizontal direction at a speed of 2.4 m/s. What is the magnitude of its horizontal speed 0.38 s later?

A. 2.5 m/s

B. 4.4 m/s

C. 3.5 m/s

D. 2.4 m/s

E. 1.9 m/s

A toy car, moving on a horizontal table 3.1 m above the floor at a constant velocity of 2.4 m/s in the x-direction, slides off the edge and takes a curved path in air onto the floor. (Neglect the air resistance.) Its equation of motion in the y-direction (assuming +y points upward and y = 0 at the table surface) is

A. y= -4.9t2 + 3.1t

B. y=-4.9 t2

C. y= 3.1 + 4.9 t2

D. y= 2.4 - 4.9t2

E. y= 4.9t2 + 2.4t

Explanation / Answer

1

The horizontal velocity of the object remains same throughout its flight

V= 2.4 m/s

Option (d) is correct

===========

2.

Considering 2nd equation of motion

Y=yo + 0*t + 0.5gt^2

Y= 31 + 4.9t^2

Option (c) is correct

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