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A bicycle and its rider have a combined mass of 90kg. The cyclist is accelerating at 0.5m/s^2. What minimum force is he exerting?

F=m•a
F=90kg•0.5m/s^2
F= 45N

However the answer on my answer key says 5×10^1

  • Science -

    However the answer on my answer key says 5×10^1 N. I'm confused on how they got that

  • Science -

    F = m a
    F = 90*.5 = 45 N
    so I agree with you

    Maybe they are rounding to one significant figure because they say 0.5 and not 0.50 ?

  • Science -

    Oh. That makes sense. I misunderstood and thought 0.5 had 2 significant figures but it has 1. Thank you so much!

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