Question

8. A body is moving with a speed of 20 m/s. When a certain force is applied, an
acceleration of 4 m/s^2 is produced. After how much time will its velocity become 80 m/s?​

Answer 1

Answer:

After 15 seconds the body will produce an acceleration of 80 m/s.

Explanation:

Given :-

︲Initial velocity (u) = 20 m/s

︲Final velocity (v) = 80 m/s

︲Acceleration (a) = 4 m/s²

To find :-

︲Time taken (t)

Solution :-

︲Using the first equation of motion,

• v = u + at

︲Substituting,

• 80 = 20 + 4t
• 80 - 20 = 4t
• 60 = 4t
• t = 60/4
• t = 15

∴ After 15 seconds the body will produce an acceleration of 80 m/s.

Answer 2

Explanation:

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