Question

Which is an expression to find the speed in m/s?

d = 100 m, t = 20 s

A. 100 - 20


B. 100 + 20


C. 100 / 20


D. 100 x 20

Answer 1

@flasht

Answer 2

You know that d = v * t?

Answer 3

d

Answer 4

@flasht Please don't give direct answers. :)

Answer 5

@aleroth that makes no sense to me

Answer 6

Okay. "d = v * t" can be interpreted as "distance = speed * time."

Answer 7

If you just remember that one, you will be able to solve every equation that involves these 3 variables.

Answer 8

ahh distance equals speed times time?

Answer 9

Indeed

Answer 10

thank you

Answer 11

In this case you want speed, so you divide both sides with time to get speed alone.
speed = distance/time

Answer 12

so it is D?

Answer 13

Not quite. You have:
d = 100 m
t = 20 s

So:
s = (100 m) / (20 s) = (5 m /s)

Answer 14

A?

Answer 15

No, you need to DIVIDE distance with time to get speed, which is what you are after. :)

Answer 16

sooo C? @aleroth

Answer 17

Yeah, it's C. I hope you understand why.

Answer 18

i do thank you

Answer 19

Remember these:
d = vt
v = d/t
t = d/v