Final answer:
The total mechanical energy of the motorcycle can be calculated using the formulas for kinetic energy and potential energy.
Step-by-step explanation:
The total mechanical energy of the motorcycle can be calculated using the equation:
Total mechanical energy (E) = Kinetic energy (KE) + Potential energy (PE)
Given that the motorcycle has a speed of 28 m/s and is at a height of 4 m:
The kinetic energy can be calculated using the formula:
KE = (1/2) * mass * velocity^2
where mass of the motorcycle = ? (the question doesn't provide this information)
The potential energy can be calculated using the formula:
PE = mass * gravity * height
where gravity = 9.8 m/s^2
Once you have the values for KE and PE, you can add them together to find the total mechanical energy of the motorcycle at that point.