Question

21. An object is moving at 5 m/s and a height of 4 m. If the object has a mass of 5 kg what is
its Mechanical Energy? (Hint: Calculate potential and kinetic energy then add)

a) 62.5 J
b) 258.5J
c) 196 J
d) 133.5 J

Answer 1

Answer: 258.7 J

Explanation:

Velocity of object V=5m/s

Mass ; 5kg

Height; h=4m

Mechanical energy is equal to sum of kinetic and potential energy

E=K+Ep

Kinetic energy is calculeted using; K=m*V²/2

Potential energy is calculated using : Ep=m*G*h

-------------------------------------------------------------------------

V=5m/s

m=5kg

h=4m

E=K+Ep

E=m*V²/2+m*G*h

E=5kg*(5m/s)²/2+5kg*9.81m/s²*4m

E=62.5J+196.2J

E=258.7 J