Question

Please answer this que 2 numerical.

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Answer 1

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Answer 2

$\textbf{Kinetic Energy = ?}$

Mass (m) = 100 g = 0.1 kg

Initial velocity (u) = 72 km/hr.

= 72 / 3.6 = 20 m/s 

OR

= 72 (5 / 18) = 20 m/s

Final velocity (v) = 144 km/hr.

= 144 / 3.6 = 40 m/s

Kinetic Energy = ?

Now,

Kinetic Energy = ½ m (v² - u²)

K.E. = ½ × 0.1 [(20)² - (40)²]

K.E. = ½ × 0.1 [1600 - 400]

K.E. = ½ × 0.1 [1200]

K.E. = 60 Joule (J)

* Here, Joule is the S.I. unit of Energy.

$\textbf{Kinetic Energy (K.E.) = 60 Joule (J)}$
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