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3 years ago

Which statement best explains the difference between velocity and speed?

Physics

2 answers:

aniked [119]3 years ago

8 0

Answer by mimiwhatsup: B) Velocity is a vector and requires a direction to completely describe it.

Velocity is the speed and direction of an object in motion.

emmainna [20.7K]3 years ago

8 0

Explanation:

Speed : It is defined as the overall distance travelled by an object divided by total time taken. The mathematical expression is given by :

$s=\dfrac{d}{t}$

It is a scalar quantity i.e. it has only magnitude.

Velocity : It is defined as the total displacement (D) of the particle divided by total time taken. It can be given by :

$v=\dfrac{D}{t}$

It is a vector quantity. It have both magnitude and direction.

Out of given options, the statement that best explains the difference between velocity and speed is (B) i.e. "Velocity is a vector and requires a direction to completely describe it".

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3 years ago

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Answer:

$s=(15-x)m$

Explanation:

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3 years ago

an object moving at 10. km/hr has a kinetic energy of 10. J. what is the kinetic energy of the same object if it is moving at 20

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Kinetic energy is related to velocity by:
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solve for mass m
10 = (1/2)m(10)^2
10 = (1/2)m(100)
10= 50m
10/50 = m
1/5 = m

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KE = (1/2)(1/5)(20)^2
KE = (1/10)(400)
KE = 40 J

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