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Calculate speed of the car when t = 6 (mechanics)

Question (i): http://prntscr.com/uhjjnr

v = u + 0.8t(t) = 13 + 0.8(6)^2 = 41.8 m/s

What did I do wrong?? The ans. is 27.4 m/s.
Original post by TSR360
Question (i): http://prntscr.com/uhjjnr

v = u + 0.8t(t) = 13 + 0.8(6)^2 = 41.8 m/s

What did I do wrong?? The ans. is 27.4 m/s.


Look, acceleration is 0.8t and not just 0.8. So it depends on time, hence it is not constant, hence SUVAT is not applicable here.

You need to use calculus.
(edited 3 years ago)
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TSR360
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Original post by RDKGames
Look, acceleration is 0.8t and not just 0.8. So it depends on time, hence it is not constant, hence SUVAT is not applicable here.

You need to use calculus.

oh right, i forgot about that. Thanks!

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