Question

4. If momentum of an object is increased by 10% then its kinetic energy will increase by (1) 20% (2) 21% Pa Tar (3) 40% (4) 19% Thron moocuromonts are made as 18 425 cm 721 cm and 5.0 cm. The addition should​

Answer 1

$option : (1) \: 20 \%$

Explanation:

$we \: \: know \: \: \boxed{K.E = \frac{ {P}^{2} }{2m} } \\ Given, \: \: \: ∆P = 10 \% \\ then, \: \: \: ∆E.K = 2 \times ∆P \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 2 \times 10 \% \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \boxed{= 20\%}$