Question

a bullet with 50 gram mass is going with the speed of 200 km per hour calculate the kinetic energy

Answer 1

Kinetic Energy of a bullet is represented by a formula,

K.E. =1/2 mv^2

where,  

mass can be represented as m

velocity can represented as v

mass=500 gram or

mass=0.05kg

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velocity=200 km/h

or

velocity=55.556m/s

K.E. =1/2  *0.05*(55.556)^2

K.E.= 77.16 Joules

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for conversion

1 km = 1000 m ,  

1 hr = 3600 sec ,

1(km/hr)={(1000)m}/{(3600)s}=(5/18) m/s.

Answer 2

(Ek) =1/2mv^2
=1/2 × 50/1000× 55.55×55.55
= 77.14 J