How much total mechanical energy does the truck have?

Question

A 2000 kg truck is moving at 5 m/s at the top of a 10 m hill. How much total mechanical energy does the truck have?

Answer 1

using E=mgh we can find mechanical energy

and it is 100000.

Answer 2

Total energy= 1/2(m)v^2 + wh =1000(25) + 2000(9.8)(10)=25000+

196000=221' 000 jouls

Answer 3

Don't have a calculator on me but it has:

Kinetic - 0.5 * 2000 * (5^2) [0.5*m*(v^2)]

Potential - 2000 * 9.81 * 10 [m*g*h]

Edit: - 3rd answere is right, calculator error on my part total energy is 221 kJ

However, it is not ME the truck has, it is doing 221 KJ of work to climb that hill.

Conservation of energy princicple....!

Answer 4

There are two types of energy the question may be asking about: kinetic energy (T) and gravitational potential energy (U). These may be calculated by the following formulae:

T = 1/2 * m * v^2

where m is the mass of the truck in kilograms (2000) and v is the velocity of the truck in meters per second (5), and

U = m * g * h

where m is the mass of the truck in kilograms (still 2000), g is the acceleration of gravity in meters per second squared (approximately 9.81), and h is the height above the reference level in meters (presumably 10).

Judging by the wording of the question, they are asking for the sum of these two.