Question

the momentum of a body of mass 4 kg is 400 kg m\sec.calculate it's K.E​

Answer 1

Answer:

Solution

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Correct option is C)

Momentum=mass×velocity

p=mu=u=

m

p

=

4 kg

8 kg ms

−1

=2 ms

−1

Acceleration=

Mass

Force

⇒a=

4 kg

0.2 N

=0.05 ms

−2

Distance travelled by the body in 10 s is

d=ut+

2

1

at

2

=(2 ms

−1

)(10s)+

2

1

×(0.050 ms

−2

)(10s)

2

=20 m+2.5 m=22.5 m

Work done, W=Fd=(0.2 N)(22.5 m)=4.5 J

According to work-energy theorem

Increasing in kinetic energy =Work done=4.5 J.

Explanation:

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Answer 2

Answer:

20000 J

Explanation:

P (momentum)= m x v

       400         =  4  x v

         v            =  400/4

         v            = 100 m/sec

K.E= 1/2 m$v^{2}$

    = 1/2 x 4 x $(100)^{2}$

    = 2 x 10000

    = 20000 J

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