Question

see the attached file this is the question of class 9 NCERT book physics question force and law of motion give me the answer fast otherwise wrong answer will be reported and maybe their account banned so Spammer keep away​

Answer 1

Question :

An object of mass 100 kg is accelerated uniformly form a velocity of 5 m/s to 8 m/s in 6 s. Calculate the initial momentum and final momentum of the object. Also find the magnitude of the force exerted on the object.

Answer :

i)

→ Initial momentum = mass × initial velocity

→ Initial momentum = 100 × 5

→ Initial momentum = 500 kg m/s ......i)

So,the initial momentum is 500 kg m/s.

ii)

→ Final momentum = mass × final velocity

→ Final momentum = 100 × 8

→ Final momentum = 800 kg m/s .......ii)

So,the final momentum is 800 kg m/s.

iii)

→ Force = Change in momentum ÷ Time taken

→ Force = 800 - 500 ÷ 6

→ Force = 300 ÷ 6

→ Force = 50 N

So,the force is 50 N.

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