QUESTION IMAGE
Question
a force of 80 n is exerted on an object on a frictionless surface for a distance of 4 meters. if the object has a mass of 10 kg, calculate its velocity. v = 16 m/s 64 m/s 4 m/s 8 m/s
Step1: Calcular el trabajo
El trabajo \(W\) se calcula como \(W = F\times d\), donde \(F = 80\ N\) y \(d=4\ m\).
\(W=80\times4 = 320\ J\)
Step2: Usar la energía cinética
La energía cinética \(K=\frac{1}{2}mv^{2}\), y como \(W = K\) (ley de conservación de la energía en superficie sin fricción), \(m = 10\ kg\).
\(320=\frac{1}{2}\times10\times v^{2}\)
\(320 = 5v^{2}\)
\(v^{2}=\frac{320}{5}=64\)
\(v=\sqrt{64}=8\ m/s\)
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8 m/s