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Arelis
Arelis asked in Science & MathematicsPhysics · 3 weeks ago

What force is needed to speed up a frictionless 60-kilogram cart from 4.0 meters per second to 6.5 meters per second in 3.0 seconds?

M =

Δvelocity = A=Time = F=Physics

2 Answers

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  • Andrew Smith
    Lv 7
    3 weeks ago

    A different approach ( that gets to the same point) impulse = change in momentum.

    F * t = m dv -> F = m dv/t = 60 *2.5/3 = 50 N

  • ?
    Lv 7
    3 weeks ago

    a = (Vf-Vi)/t = (6.5-4)/3 = 5/6 of m/sec^2

    F = m*a = 60*5/6 = 50 N 

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