Question

PLEASE HELP:
An automobile accelerates at 1.77 m/s^2 over 6.00s to reach the freeway speed at the end of an entrance ramp. If the car's final speed is 88.0 km/h, what was its initial speed when it began accelerating? Express your answer in kilometers per hour.

Answer 1

\[a = \frac{\Delta v}{t} = \frac{v_f - v_o}{t}\]

Answer 2

Use this formula.

Answer 3

i know the formula im just having trouble converting the units

Answer 4

Alright, let convert 88 km/h to m/s. \[\frac{ 88 \text{km} }{ \text{h} }\cdot\frac{ 1000 \text{m}}{ \text{km} }\cdot\frac{ 1 \text{h} }{ 3600\text{s} } = ?\]

Answer 5

Does this clear everything?

Answer 6

24.4

Answer 7

yea

Answer 8

Yeah, now find Vo

Then convert it back to km/h

Answer 9

so is it 13.78?

Answer 10

km/h

Answer 11

13.78
Is it in m/s ?

Answer 12

oops yes

Answer 13

how would i convert it back

Answer 14

Let me show you.

Answer 15

\[\frac{13.78 \cdot 3600 \text{km}}{1000 \text{h}}\]

Answer 16

Just treat units as "variable." You know what I mean?

Answer 17

ok

Answer 18

so it would be 49.6 km/h

Answer 19

That's correct.

Answer 20

ok ty