Question

Mr. Palmer's dog is running at you at a a speed of 3.8 m/s. She has a KE of 231.04 J. How massive is Mr. Palmer's dog?

answer

Answer 1

32kg

Step-by-step explanation:

Given parameters:

Speed of the dog = 3.8m/s

Kinetic energy = 231.04J

Unknown:

Mass of Mr.Plamer's dog = ?

Solution:

Kinetic energy is the energy due to the motion of a body;

Mathematically, it is represented as;

K.E =
`(1)/(2)` m v²

m is the mass

v is the velocity

Insert the parameters and solve;

231.04 =
`(1)/(2)` x m x 3.8²

231.04 x 2 = 2 x
`(1)/(2)` x m x 3.8²

462.08 = 14.44m

m = 32kg