Question

Usain Bolt, the world famous sprinter, of
mass 94 kg completes a 100 m race in 9.6 s.​

Answer 1

Answer:

Given data : Usain Bolt, the world famous sprinter, of mass 94 kg completes a 100 m race in 9.6 s.  

To find : Kinetic energy of Usain Bolt ?

Solution : Now, according to given,

⟹ Mass of Usain Bolt = 94 kg

⟹ Displacemet of Usain Bolt = 100 m

⟹ Time taken by Usain Bolt = 9.6 sec

Usain Bolt completes a 100 m race in 9.6 sec.

Now, by formula of velocity :

⟹ velocity = displacemet/time

⟹ velocity = 100/9.6 m/s

Now, by formula of kinetic energy :  

⟹ K.E. = ½ * m * v²

⟹ K.E. = ½ * 94 * (100/9.6)²

⟹ K.E. = ½ * 94 * 10000/92.16

⟹ K.E. = 47 * 10000/92.16

⟹ K.E. = 47 * 108.5069444

⟹ K.E. = 5099.826389 joule

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Answer 2

• Kinetic energy of Usain Bolt is 5099.826389 joule

Given that :-

• Mass of Usain Bolt = 94 kg
• Displacement of Usain Bolt = 100 m
• Time taken by Usain Bolt = 9.6 sec

To find :

• Kinetic energy of Usain Bolt

Solution :

We know that,

→ Velocity =Displacement/ Time

→ velocity = 100/9.6 m/s

Using formula of kinetic energy :

→ K.E. = ½ × m × v²

→ K.E. = ½ × 94 × (100/9.6)²

→ K.E. = ½ × 94 × 10000/92.16

→ K.E. = 47 × 108.5069444

→ K.E. = 5099.826389 joule

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