Question

Q-57. A body travelling with a velocity of
20ms -7 gains an acceleration of 10.5
-2
and travels a distance of 100 m.
The final velocity of the body is
ms
A) 20 ms -1
B
50 ms
- 1
©
C) 80 ms
-1
D) 90 ms -1​

Answer 1

Correct Question :-

A body travelling with a velocity of 20 m/s and gains an acceleration of 10.5 m/s² and travels a distance of 100 m. Find the final velocity of the body.

A) 20 m/s

B) 50 m/s

C) 80 m/s

D) 90 m/s

Answer :-

Given :

• Initial velocity (u) = 20 m/s
• Acceleration (a) = 10.5 m/s²
• Distance (s) = 100 m

To find :

• Final velocity (v)

According to the question,

By using Newton third equation of motion,

→ v² = u² + 2as

Where,

• v stands for Final velocity
• u stand for Initial velocity
• a stands for Acceleration
• s stands for Distance

→ Substituting the values,

→ v² = (20)² + 2 × 10.5 × 100

→ v² = 400 + 2100

→ v² = 2500

→ v = 50

.°. The final velocity is 50 m/s.

So,the correct option is B) 50 m/s..

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