Answer:
The statement is true:
Explanation:
As said in the statement, we need to measure the mechanical energy(M.E) of the phone at the instant is dropped:
M.E = P.E + K.E
Given the fall hasn't yet begun, the kinetic energy (K.E) is equal to zero so M.E = P.E
We must use the Potential Energy formula :
P.E = h x m x g
We know that g is equal to 9.8 [tex]J.kg^{-1} .m^{-1}[/tex] on Earth, the height is 15m and m is 0.115:
M.E = 15 x 0.115 x 9.8 = 16.9 Joules
