Question

The kinetic energy od an object moving with a velocity of 5m/s is 25J. Find the mass of the object. what will be it 's kinetic energy when it 's velocity is made a)Two times b)Three times Justify answer

Answer 1

Velocity = 5 m/s Work done = 25 J Mass= ? K.E= 1/2 m v^2 25= 1/2 × m × 5^2 25×2 = 25m 50 = 25m 50÷25 = m m= 2 Mass = 2 kg a)the kinetic energy will be increased by 4 times. 25 × 4 = 100 J B) the kinetic energy will increase by 9 times 25 × 9 = 225 J

Answer 2

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ANSWER :

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The mass of the object, m = m kg

The speed of the object, v = 5 m/s

The Kinetic Energy, K.E = 25 J

We know that ,

$kinetic \: energy = \frac{1}{2} mv ^{2}$

From this ,,,

Kinetic Energy ,K.E = 1/2 × m× (5)^2

25 = 1/2 × m × 25

m = 2 kg

(i) Now the Velocity of the object is doubled,,

v2 = 2v1

= 2( 5)

v2 = 10 m/s

Kinetic Energy, K.E = 1/2 × m × (v2)^2

= 1/2 × 2 × 10^2

= 100 J

The Kinetic Energy is 100 J.

(ii) Now the velocity is tripled ,,

v3 = 3v1

= 3 ( 5)

v3 = 15 m/s

Kinetic energy, K.E = 1/2 × m × (v3)^2

= 1/2 × 2 × (15)^2

= 225 J

The kinetic energy is 225 J

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