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5. A car stops in 20 m. If it has an acceleration of-6m/s?, how fast was it going before you started slowing down?
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20 votes
20 votes
5. A car stops in 20 m. If it has an acceleration of-6m/s?,

how fast was it going before you started slowing down?

User Romesh
by
2.5k points

1 Answer

25 votes
25 votes

Answer:

15.49 m/s

Step-by-step explanation:

We know that the stopping distance is ,

=> s = u²/2(-a)

So that ,

=> 20m = u² / 2* 6m/s²

=> u² = 240m²/s²

=> u = √240 m²/s²

=> u = 15.49 m/s

**Edits are welcomed**

User Nayroby
by
2.9k points
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