Homework Help: Science-Physics

Posted by Shweta on Monday, February 18, 2013 at 3:20pm.

20 (part 1 of 2)
The initial speed of a body is 6.61 m/s.
What is its speed after 3.92 s if it accelerates
uniformly at 3.46 m/s/s?
Answer in units of m/s

21 (part 2 of 2) 10.0 points
What is its speed after 3.92 s if it accelerates
uniformly at −3.46 m/s/s?
Answer in units of m/s
What is the answer for 21?

Science-Physics - JJ, Monday, February 18, 2013 at 5:06pm
Initial speed plus the acceleration times the time.

6.61 m/s + 3.46 m/s/s times 3.92 s
6.61 m/s + ____ m/s (fillin the blank with 3.46 times 3.92).

The same principle applies, but you will be multiplyint by -3.46 which will result in a decrease in the speed.

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