If an object with a mass of $12 k g$ $12 kg$ changes speed from $3 \frac{m}{s}$ $3 m/s$ to $2 \frac{m}{s}$ $2 m/s$ , by how much does its kinetic energy change?

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Answer 1 · 2016-01-16T09:21:38

increase = 42j

$k . e = \frac{1}{2} m v^{2}$ $k.e =1/2mv^2$
#k.e1=1/2 12* 3^2#
=54 $J$ $J$
k.e2=x6x16
=96 $J$ $J$
increase=96-54=42J

If an object with a mass of 12kg12 kg changes speed from 3ms3 m/s to 2ms2 m/s, by how much does its kinetic energy change?