Could you please double check this answer and tell me where I went wrong?

Question

A rocket accelerates at 19.6 ms# -2# for 7.50s. what would be its change of velocity?

19.6 x 7.5= 147
147= 14.7 ms#-2#

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Answer 1 · 2018-05-06T06:22:10

I'm not sure how you arrived at #14.7#.

#147 "m"/"s"# should be correct as long as you realize the units of velocity are #"m"/"s"# and not #"m"/"s"^2#.

#a = 19.6 "m"/"s"^2#

#t = 7.50 "s"#

#v = at = (19.6)(7.50) = 147 "m"/"s"#