Science: Please check answer

2. Once your rocket reaches space, the captain adjusts the speed. Your captain goes from 24,000 km/hr to 17,000 km/hr over 90 seconds. What is your acceleration?
Beginning speed= 17,000km/hr
Ending speed= 24,000 km/hr
Time it took= 90/sec


17000-24000= -7000/90= -77.778km/hr

Should it be ^2?

Please Check

Thank you.

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asked by Cassie
  1. I just need someone to look at this and tell me if it is correct or if I have to convert anything - I am unsure

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    posted by Cassie
  2. You have a mistake: the rate is given in units of km/hr, but the time is given in seconds. You have to convert 90seconds to hours before proceeding with the calculations.

    90 seconds*(1 min/60 seconds)*(1 hr/60 minutes)= time in hours.

    (17,000km/hr-24,000km/hr)/time in hours=correct answer

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    posted by Devron
  3. Report your answer as --- km/hr^2.

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    posted by Devron
  4. Devron is it 280,000 km/hr^2??

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    posted by Cassie
  5. Yes and no, since the rocket is decelerating. So, is the final answer 280,000 km/hr^2 or is it - 280,000 km/hr^2?

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    posted by Devron
  6. You could have just had a typo, but I just want to make sure that you understand.

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    posted by Devron
  7. it's -280,000 km/hr^2

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    posted by Cassie
  8. Bingo!!

    Best and good luck.

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    posted by Devron
  9. Thank you so much Devron - I really appreciate your help.

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    posted by Cassie

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