Question

If a force of 12 N acting on a body changes its velocity uniformly from 2 m/s to 5 m/s in 20 s then what is the mass of the body? A. 40 kg B. 48 kg C. 80 kg D. 96 kg​

Answer 1

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Answer 2

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EXPLANATION.

Force of 12N acting on a body. Change its velocity uniformly from 2 m/s to 5 m/s.

In 20 seconds.

As we know that,

Formula of:

Newton first equation of motion.

⇒v=u+at.

Using this formula in the equation, we get.

Initial velocity = u = 2 m/s.

Final velocity = v= 5 m/s.

time = t = 20 seconds.

Put the values in the equation, we get.

⇒v=u+at.

⇒5= 2 + a(20).

⇒5-220a.

⇒ 3 = 20a.

⇒a= 3/20.

⇒a= 0.15 m/s².

As we know that,

Force = Mass x Acceleration.

⇒ 12 = M x 0.15.

⇒ 12/0.15 = M.

⇒ M = 80 kg.

Mass of the body = 80 kg.