An object travelling at $30m/(sec.)$ has kinetic energy $33,750$ joules. What is its mass?

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Answer 1 · 2016-12-21T15:13:25

Mass of the object is $75$ kg.

Energy $E$ of an object of mass $m$ kg. travelling at $v$ $m/(sec.)$ is $1/2mv^2$ joules.

Hence, mass is given by $(2E)/v^2$

As energy is $33,750$ joules and object is traveling at $30$ $m/(sec.)$ ,

its mass is $(33750xx2)/(30xx30)=67500/900=75$ kg.

An object travelling at 30m/(sec.)30m/(sec.) has kinetic energy 33,75033,750 joules. What is its mass?