Question

A body is moving with a speed of 20 m/s. When a certain force is applied, an
acceleration of 4 m/s” is produced. After how much time will its velocity become
80 m/s?
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Answer 1

Answer:

      time = 15seconds

Step-by-step explanation:

initial velocity (u) = 20m/s

acceleration (a) = 4m/s

final velocity (v) = 80m/s

v = u +at

80 = 20 + 4t

4t = 80 - 20

4t = 60

t = 60 / 4

t = 15s

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Answer 2

Step-by-step explanation:

the required time is 20 seconds