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Question #2a2ef

1 Answer

Jul 21, 2017

$K = 4 k J$ $K=4kJ$

Explanation:

$F = m a \Rightarrow a = \frac{F}{m} \Rightarrow a = \frac{20}{5} = 4 \frac{m}{s^{2}}$ $F=ma =>a=F/m=>a=20/5=4m/s^2$

so the velocity is : $v = a t = 4 \cdot 10 = 40 \frac{m}{s}$ $v=at=4*10=40m/s$

The kinetic energy is then :

$K = \frac{1}{2} m v^{2} = \frac{1}{2} \cdot 5 \cdot 40 \cdot 40 = 5 \cdot 20 \cdot 40 = 4000 J = 4 k J$ $K=1/2mv^2=1/2*5*40*40=5*20*40=4000J=4kJ$

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