Question

Given that the kinetic energy of an object is 100J.If the mass of object is 2kg then find it's speed.​

Answer 1

The speed of an object(v) is "10 $\dfrac{m}{s}$".

Explanation:

Given,

The kinetic energy of an object(K.E.) = 100 J, Mass of an object(m) = 2 kg

To find speed of an object(v) = ?

We know that,

Kinetic Energy,(K.E.) = $\dfrac{1}{2}$ × m·$v^{2}$

⇒  $\dfrac{1}{2}$ × 2 × $v^{2}$ = 100

⇒ $v^{2}$ = 100

⇒ v = $\sqrt{100}$ = 10 $\dfrac{m}{s}$

Hence, the speed of an object(v) = 10 $\dfrac{m}{s}$.

Answer 2

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ANSWER :

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The mass of the object, m = 2 kg

The speed of the object, v = ?

The Kinetic Energy, K.E = 100J

We know that ,

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

From this ,,,

Kinetic Energy ,K.E = 1/2 × 2 × (v)^2

100 = ( v)^2

v = (100)^1/2

v = 10 m/s

The Speed is 10 m/s.

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