Question

A bird of mass 2 kg is flying at an altitude of 100 m with a speed of 5 m/s. Calculate the mechanical energy of the bird. (g - 10 m/s²)
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Answer 1

Answer:

mass of bird = 2kg

height = 100m

velocity = 5m/s

therefore, mechanical energy = KE + PE

KE = ½mv²

= ½ × 2 × 5²

= 25 J

PE = mgh

= 2 × 10 × 100

= 2000 J

therefore, total energy or mechanical energy =

25+2000

= 2025 J

hope it helped :)

Answer 2

Given :-

☄ Mass of the bird, m = 2 kg

☄ Altitude of flying, h = 100 m

☄ Speed of flying, v = 5 m/s

☄ acceleration due to gravity, g = 10 m/s²

To find :-

the mechanical energy of the bird

Solution :-

first we have to find potential energy and kenitic energy

we know that,

➠ Potential energy, P.E = mgh

➠ P.E = (2)(10)(100)

➠ P.E = 2000J

and similarly,

➠ kenitic energy K.E = 1/2mv²

➠ K.E = 1/2(2)(5)²

➠ K.E = 50/2

➠ K.E = 25J

As we know,

Mechanical energy = Potential energy + kenitic energy

➠ M.E = P.E + K.E

➠ M.E = 2000 + 25

➠ M.E = 2025 J

thus, mechanical energy of the bird is 2025 J

$⠀⠀⠀⠀$

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