distance 2 cars

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if car A is going 40 mph and car B is stationary , how fast would car b have to go to cath up to car A in 4/10 of a mile

  • distance 2 cars -

    s=0.4 miles
    s=v(A)•t =>
    t= s/v(A)=0.4/40=0.01h.
    For the car B:
    s=a•t²/2,
    v(B)=a•t.

    s/v(B) = a•t²/2• a•t=t/2
    v(B)=2s/t=2•0.4/0.01=80 mph

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