Question

When the Momentum of a body decreases 10 percent, its K.E. decreases by
(a.) 20 percent
(b.) 40 percent
(c.) 36 percent
(d.) none of these

Answer plz....​

Answer 1

Explanation:

HEY MATE ........

$\frac{ {p}^{2} }{2m} = k.e \\ \\ p1 = 0.9p \\ \\ k.e.1 = \frac{ {p1}^{2} }{2m} \\ \\ \implies( {0.9}^{2} ) \frac{ {p}^{2} }{2m} \\ \\ \implies0.81 \: k.e \\ \\ so \: k.e \: decreased \: by \: 19\% \: \: \\ \\ k.e = kinetic \: energy \: \\ \\ \\ \\ so \: the \: boll \: has \: both \: the \: k.e \: and \: p.e$

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