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A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 81 km/hr in 10 seconds. What is the speed after the first 7 seconds of acceleration?
A) 157.5 m/s
B) 22.5 m/s
C) 56.7 m/s
D) 15.8 m/s
E) 32.1 m/s

Obviously, first convert to m/s.

  • physics -

    yes convert km/hr to m/s.

    Then acceleration is deltaV/time

    speed= a*7

  • physics -

    okay, so d then :)

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