Question

a body of mass 60 kg is moving with the speed of 36 kmph find its kinetic energy​

Answer 1

Answer:

$\displaystyle \text{3 kJ}$

Explanation:

$\displaystyle \text{Given : }$

$\displaystyle \text{Mass of body is 60 kg . }$

$\displaystyle \text{Speed is 36 km/hr}$

$\displaystyle \text{In term of m/sec}$

$\displaystyle \text{Speed is 36\times5 /18 = 10 m/sec .}$

$\displaystyle \text{We know formula for kinetic energy :}$

$\displaystyle \text{K.E. = 1/2 m v^2 }$

$\displaystyle \text{Putting values here we get :}$

$\displaystyle \text{K.E. = 1/2\times60 \times10\times10 J}$

$\displaystyle \text{K.E. = 30\times 100 J}$

$\displaystyle \text{K.E. = 3000 J}$

$\displaystyle \text{In term of kJ}$

$\displaystyle \text{K.E. = 3 kJ}$

$\displaystyle \text{Hence we get answer}$ .  

Answer 2

Answer:

${\bold{\therefore K.E\:of\:body=3000\:J}}$

${\bold{\huge{\underline{SOLUTION-}}}}$

• In the given question information given about mass of body and its velocity is given.

• We have to find its kinetic energy.

$\underline \bold{Given : } \\ \\ \implies Mass \: of \: object = 60kg \\ \\ \implies Speed \: of \: object = 36 \: kmh \\ \\ \underline \bold{To \: Find : } \\ \\ \implies Kinetic \: energy \: of \: body = ?$

• According to given question :

$\bold{Convert \: km/ h \: into \: m/s : } \\ \implies speed = 36 \times \frac{5}{18} = 10 \: m/s \\ \\ \bold{Formula \: of \: kinetic \: energy : } \\ \implies K.E = \frac{1}{2} m {v}^{2} \\ \\ \bold{m = mass \: of \: object} \\ \bold{v = velocity \: of \: object} \\ \\ \implies K.E= \frac{1}{2} \times 60 \times {10}^{2} \\ \\ \implies K.E= 30 \times 100 \\ \\ \bold{\implies K.E= 3000 \: J} \\ \\ \bold{\therefore K.E \: of \: body \: is \: 3000 \: J}$