Question

Find the momentum of a body of mass 10kg having a kinetic energy of 5J.

Answer 1

Answer:

ANSWER

t=10sec

10=5×v[P=mv]

v=2m/s

As F=0.2N

a=

5

0.2

m/s

2

=

25

1

m/s

2

[a=

m

F

]

at t=0,KE=

2

1

×s×(2)

2

[KE=

2

1

mv

2

]

KE

i

=10J

Now, at t=10sec, v

f

=u+at

v

f

=g+

25

1

×10=2.4m/s

2

∴KE

f

=

2

1

×5×(2.4)

2

=14.4J

∴△KE=14.4−10

=4.4J

Answer 2

Physics

Newton's Law of Motion

Answer :

Mass of body = 10kg

Kinetic energy = 5J

We have to find kinetic energy of body$.$

➤ Relation between kinetic energy and momentum of moving object is given by

• K = P²/2m

K denotes kinetic energy

P denotes momentum

m denotes mass of body

⭆ K = P²/2m

⭆ 5 = P²/2(10)

⭆ 5×20 = P²

⭆ P = √100

⭆ P = 10 Ns

Cheers!