Which statements about velocity are true? check all that apply. a. for velocity, you must have a number, a unit, and a direction. b. the si units for velocity are miles per hour. c. the symbol for velocity is. d. to calculate velocity, divide the displacement by time.

Question

Physics

Dodger

19 January, 10:14

Which statements about velocity are true? check all that apply. a. for velocity, you must have a number, a unit, and a direction. b. the si units for velocity are miles per hour. c. the symbol for velocity is. d. to calculate velocity, divide the displacement by time.

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Answers (1)

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Lennon Zamora · Answer 1

a). for velocity, you must have a number, a unit, and a direction.

Yes. This one isn't bad. The 'number' and the 'unit' are the speed.

b). the si units for velocity are miles per hour.

No. That's silly.

'miles' is not an SI unit, and 'miles per hour'

is only a speed, not a velocity.

c). the symbol for velocity is.

You can use any symbol you want for velocity, as long as

you make its meaning very clear, so that everybody knows

what symbol you're using for velocity.

But this choice-c is still wrong, because either it's incomplete,

or else it's using 'space' for velocity, which is a very poor symbol.

d). to calculate velocity, divide the displacement by time.

Yes, that's OK, but you have to remember that the displacement

has a direction, and so does the velocity.