What is the kinetic energy of a #16 kg# object moving at #4 m/s#?

2 Answers
Mar 9, 2018

Answer:

128 joules

Explanation:

kinetic energy=#frac{1}2 xx mass xx (velocity)^2#
thus,#frac{1}2 xx 16xx16 or 128" joules"# is the kinetic energy of the body

Mar 10, 2018

Answer:

#128# joules

Explanation:

The kinetic energy of an object is expressed through the equation:

#"KE"=1/2mv^2#

where #m# is the mass of the object in kilograms, #v# is the velocity of the object in meters per second.

We got: #m=16 \ "kg", v=4 \ "m/s"#

So, plugging in the values into the equation, we get

#"KE"=1/2*16 \ "kg"*(4 \ "m/s")^2#

#=8 \ "kg"*16 \ "m"^2"/s"^2#

#=128 \ "kg m"^2 \ "s"^2#

Know that #1 \ "kg m"^2 \ "s"^2=1 \ "J"#.

So, we got #128 \ "J"# of kinetic energy, i.e. the object's kinetic energy is #128# joules.