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DENIUS [597]
3 years ago
14

A glass falls off a shelf. How fast is the glass moving after 0.4 seconds?

Physics
2 answers:
Rufina [12.5K]3 years ago
8 0

Answer:

3.9 m/s

Explanation:

Apex ; good luck everyone! :)

tresset_1 [31]3 years ago
6 0

On Earth, gravity increases the speed of a falling object by about 9.8 m/s
every second that it falls.

In 0.4 second, its speed increases by (0.4 x 9.8) = 3.92 m/s.

If it just rolled off of the shelf at the beginning of that 0.4 second, then it
started from zero speed, and its speed after 0.4 second is 3.92 m/s.

Its velocity is 3.92 m/s downward.


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Answer:

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Explanation:

Acceleration is given by

a=\frac{v-u}{t}

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v is the final velocity

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In this problem:

u = 10 km/h \cdot \frac{1000 m/km}{3600 s/h}=2.78 m/s is the initial velocity

v = 8 km/h \cdot \frac{1000 m/km}{3600 s/h}= 2.22 m/s is the final velocity

t = 2 s is the time

Substituting, we find the acceleration:

a=\frac{2.78-2.22}{2}=0.28 m/s^2

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