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Yakvenalex [24]
3 years ago
14

An object is moving initially with a velocity of 4.7 m/s . After 3.9 s the object's velocity is -2.1 m/s . What is the object's

average acceleration during this time?
I believe that the vf is -2.1 m/s vi should be 4.7 m/s and the t should be 3.9s but its wrong..? #confused
Physics
1 answer:
IgorC [24]3 years ago
8 0

Answer: The acceleration of the object is 0.67m/s^2 west.

Explanation: Here we are given the initial velocity and final velocity as well as the time taken. Acceleration is the change in velocity per unit time, thus the equation becomes.

a=dv/t

a=vf-vi/t

a=-2.1-4.7/3.9

a= 0.66m/s^2 west

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A man is standing on the edge of a 20.0 m high cliff. He throws a rock horizontally with an initial velocity of 10.0 m/s.
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Answer:

<em>a. The rock takes 2.02 seconds to hit the ground</em>

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