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igor_vitrenko [27]
3 years ago
14

Determine the kinetic energy of a girl of mass 40kg running with a velocity of 3m/s

Physics
2 answers:
KiRa [710]3 years ago
8 0

Answer:

Mass = 40 kg

Velocity = 3m/s

Kinetic energy = mv^2/2

= 40 x 3 x 3/2

= 180 J

Hope this helps!

kotegsom [21]3 years ago
4 0
0.5mv^2
0.5 times 40 times 3^2
The kinetic energy is 180
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Answer:

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The best estimate of the depth of the well is 2.3 sec.

Explanation:

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t_{1}=2.19\ sec

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According to record time,

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t_{1}=2.19\approx 2.2\ sec

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Answer:

Velocity (m/s) over time (s) graph

Velocity (m/s) over time (s) graph

We could write out our average acceleration as:

a = Δv/ Δta=Δv/Δta, equals, Δ, v, slash, Δ, t

a = (15 m/s - 0 m/s) / 0.2 seconds

a = 15 m/s / 0.2 seconds

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Explanation:

What this formula is telling us is that if we know the acceleration of an object, and the ... we can plug in our acceleration of 12.5 m/s2 for a, and 4 seconds for t.

Velocity (m/s) over time (s) graph

Velocity (m/s) over time (s) graph

We could write out our average acceleration as:

a = Δv/ Δta=Δv/Δta, equals, Δ, v, slash, Δ, t

a = (15 m/s - 0 m/s) / 0.2 seconds

a = 15 m/s / 0.2 seconds

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The answer is C.  

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