A2.80 kg mass is dropped from a height of 4.50 m. what is its total mechanical energy(me)?me

123 J

Explanation:

Mechanical energy = potential energy + kinetic energy

ME = PE + KE

ME = mgh + ½ mv²

ME = (2.80 kg) (9.8 m/s²) (4.50 m) + ½ (2.80 kg) (0 m/s)²

ME = 123 J

126Joules.

Explanation:

The kind of mechanical energy possessed by this body is known as potential energy. Potential energy is the energy possess by a body by virtue if its position.

P.E = mass×acceleration due to gravity×height

P.E = 2.8×10×4.5 (taking g as 10m/s²)

P.E = 126Joules.

The total mechanical energy possessed by the body is 126Joules

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray