Question

A car is moving with a uniform velocity of 54 KM per hour.what is the kinetic energy of a boy of mass 40 KG sitting in car

Answer 1

$\huge\underline{\overline{\mid{\bold{\orange{ANSWER-}}\mid}}}$

GIVEN:

• Velocity=54 km/h=15 m/s
• mass 40 kg

FORMULA:-

${KE= \dfrac{1}{2}mv^2}$

SOLUTION:-

Putting values in formula we get,

$K.E.= \dfrac{1}{2} \times 40 \times 15^2$

K.E. = 4500J

Answer 2

AnSwEr :

${\red\bigstar\Large\bold{\underline{\textsf{\green{Given:}}}}}$

• Velocity = 54 km/hr

= $\sf 54 \times \dfrac{5}{18}$ = 15 m/s

• Mass = 40 kg

${\red\bigstar\Large\bold{\underline{\textsf{\green{To\:Find:}}}}}$

• Kinetic Energy

${\red\bigstar\Large\bold{\underline{\textsf{\green{Solution:}}}}}$

☯ FORMULA USED :

$\Large\bold{\boxed{\boxed{\sf{\pink{K.E.\:=\: \dfrac{1}{2}m{v}^{2}}}}}}$

• K.E. = $\sf \dfrac{1}{2} \times 40 \times {15}^{2}$

• K.E. = 4500 J

${\orange\bigstar\Large\bold{\underline{\textsf{\red{Kinetic\:Energy\:=\:4, 500\:Joules}}}}}$

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