Question

A toy plane has a mass of 2.5kg and is 18 m above the ground. It is moving 4.5 m/s.

how much mechanical energy does the toy have?
A. 416J
B. 441J
C. 466J
D. 491J
​

Answer 1

Answer:

466J (c)

Explanation:

Mechanical Energy= Kinetic+Potential

Potential energy= mgh

Plug in givens

mgh=2.5*18*9.8=441J

Kinetic Energy = 1/2mv^2

Plug in givens

1/2mv^2= 1/2(2.5)(4.5)^2= 25.3125J

Mechanical energy= 441J+25.3125J=466.3125J or 466J