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

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

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .

80cm/s.

24cm/s.

53.3cm/s.