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lisov135 [29]
4 years ago
13

What causes a rolling object

Physics
1 answer:
Serjik [45]4 years ago
7 0
Gravity but when it is rolling it has kinetic energy.
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An object is falling from a height of 7.5 meters. At what height will its velocity be 7 meters/second?
Ivanshal [37]

Answer:

5.0 m

Explanation:

The velocity of the object at time t is given by

v=at

where a=9.8 m/s^2 is the acceleration of gravity and t is the time. If we substitute v=7 m/s, we can find the time t at which the velocity became 7 m/s:

t=\frac{v}{a}=\frac{7 m/s}{9.8 m/s^2}=0.71 s

The height of the object at time t, h(t), is given by the equation

h(t)=h_0 -\frac{1}{2}at^2

where h_0 = 7.5 m is the initial height. By substituting t=0.71 s inside the equation, we find the height h(t) at which the velocity is 7 m/s:

h(0.71 s)=7.5 m- \frac{1}{2}(9.8 m/s^2)(0.71 s)^2=5.0 m

8 0
3 years ago
A toy car accelerates at 3 m/s2 for 2 seconds. Its final velocity is 15 m/s, What is its initial velocity?
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Explanation:

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3 years ago
In the equation , what do the terms vx, v0x, x, and x0 stand for respectively?
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Explanation:

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and t is time.

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3 years ago
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