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Inessa [10]
4 years ago
5

Which Phrase describes velocity?

Physics
1 answer:
Sav [38]4 years ago
5 0

Answer:

C. a quantity with magnitude and direction

Explanation:

These are the options for the question

A. a quantity of magnitude only

B. a quantity with direction only

C. a quantity with magnitude and direction

D. a quantity with no units.

Velocity is the distance cover per time, it is the rate at which an object change its position with respect to time.

Velocity is a vector quantity unlike speed which is a scalar quantity, velocity is the speed of an object with a specific direction.

For instance, the distance cover by Mr. A is 10m, at 2 seconds, this show a magnitude and direction, then velocity here is 10/2=5m/s

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Explanation:

mass of baseball, m = 0.145 kg

initial velocity, u = 12 m/s upward

(a) final velocity, v = u / 2 = 6 m/s

Let the height is h.

Use third equation of motion

v² = u² - 2gh

6 x 6 = 12 x 12 - 2 x 9.8 x h

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h = 5.51 m

(b) initial kinetic energy, K = 0.5 x m x u² = 0.5 x 0.145 x 12 x 12 = 10.44 J

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v = 8.5 m/s

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8.5 x 8.5 = 12 x 12 - 2 x 9.8 x h

72.25 - 144 = - 19.6 x h

h = 3.66 m

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