Question

calculate the velocity of the body of mass of 5kg having a momentum of 18kgm/s
​

Answer 1

Answer:

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Step-by-step explanation:

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