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1..A body of mass 2 kg is at rest. What should be the magnitude of force which will make the body move witha speed of 30 m/s at the end of 15s?

2..A body of mass 2 kg is at rest. What should be the magnitude of force which will make the body move witha speed of 30 m/s at the end of 1s?

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Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

1. Given that,

Mass = 2 kg

u = 0, v = 30 m/s, t = 15 s

Acceleration = (v - u)/t

= (30 - 0)/15

= 30/15

= 2 m/s²

According to Newton's 2nd Law,

F = ma

= 2 × 2

= 4 N

Ans. 4 Newton is the magnitude of force which will make the body move with a speed of 30 m/s at the end of 15 s.

2. Given That,

Mass = 2 kg

u = 0, v = 30 m/s, t = 1 s

Acceleration = 30 / 1

= 30 m/s²

According to Newton's 2nd Law,

F = ma

= 2 × 30

= 60 N

Ans. 60 N is the magnitude of force which will make the body move with a speed of 30 m/s at the end of 1 s.

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