I want question no. 6 and 7 and their subquestion full
Pls send fast

I want question no. 6 and 7 and their subquestion full Pls send fast Q. VI. Ansqer the following. I F.xplain with suitable examples, how. you will differentiate between positive, negatne and zero work. 2) If momentum of m. bodies arv equal. will their kinetic energies he equal. explain. 3) of same mass are mosing ssilh s elocities in the ratio respectively. What "ill the ratio of ux•ir energies? Q. V II. Solu• the numericals. I If a IN of rating 200 W is operated tor 6 hrs per day. find the number of units in any leap year. 2) When a fcyce of 30 N acts on a body the body is displaced by 10 m in the at to the force. Find the " ork clone by the force? (Cos v:)

Dear Student,

VI) 1)

1. When θ is acute (<90), cosθ is positive. Hence work done is positive.

example: when a body falls freely under the action of gravity. 

cos0 = 1. therefore work done by the gravity on the body falling freely is +ve. 

2. When θ is acute (>90), cosθ is -ve. Hence work done is -ve.

example: when a body is thrown up, its motion is opposed by the gravity. the angle θ b/w gravitational force and displacement is 180. cos 180 = -1,  therefore work done by the gravity on a body moving upward is -ve.


 when, θ = 90

cos90 = 0

work done is said to be zero. 

example: when a body tied to one end of a string is rotating in a circle, work done by the centripetal force applied along the string is zero because 

 θ = 90

cos90 = 0

2) let mass of light body be 'm' & heavy body be 'M' 

given that  mV=Mv

We know that K E=p2 /2m

since as p is constant K E is inversly proportional to the mass of the object

hence light body has greater kinetic energy

Hope this information will clear your doubts about topic.

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