What is the velocity of a 800 kg roller coaster car at a height of zero if its mechanical energy at the highest point is 165,800 J? A. 14.4 m/s
B. 0 m/s
C. 414.5 m/s
D. 20.4 m/s

B. 0 m/s

Explanation:

Given parameters:

Mass of roller coaster  = 800kg

Height  = 0

Mechanical energy at highest point  = 165800J

Unknown:

Velocity  = ?

Solution:

The mechanical energy is the sum of the potential and kinetic energy within a give system.

At the highest point, the velocity of the roller coaster will be zero.

All the kinetic energy would have been transformed into potential energy.

So, the velocity is 0m/s

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.

a=d/t

a="triangle"v/t

explanation:

a = acceleration