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

1 Answer
Dec 21, 2016

Answer:

Mass of the object is #75# kg.

Explanation:

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.