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A particle has a mass of 1.45 g and is moving at an average velocity of 13.5 cm/s. Calculate the kinetic energy for this particle. (Be sure to look carefully at the units).

__ #g(cm^2)/s^2#

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Answer 1 · 2018-02-24T18:37:01

#1321 g (cm/s)^2# rounding to three significant digits

#1320 g(cm/s)^2#

kinetic energy is # 1/2 xx m xx v^2 #

The mass is 1.45 g
The velocity is 13.5 cm/s

putting these values in for mass and velocity yields

# 1320 g( cm/s)^2 #

It is possible the instructor wants the units changed to meters/s and kilograms

Answer 2 · 2018-02-24T19:30:57

#Ek = 1.321xx10^-5 J#

#Ek = 1/2 m v^2#

Remember that the SI unit for mass is kilograms and the SI unit for velocity is metres per second.

#Ek = 1/2 * 0.00145 * 0.135^2#

#Ek = 1.321xx10^-5 J or (kg * m^2)/s^2#