1iv
some work will also be done against friction
A:Work done by the engine of the car is equal to the change in its K.E.
B:Internal forces can increase the K.E. of the system
(i)Both true,B is the correct explanation of A
(ii)Both true B is not the correct explanation of A
(iii)A is true,B is false
(iv)B is true,A is false
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11 Answers
106then it is wrong.. Stment 2 is definitely correct.
Take a system of two particles of mass m each placed at some distance apart. There is no net force on the system yet after some time they will have increased kinetic energies because work done by the gravitational forces is +ve here... And here they are internal forces in the system... So, internal forces can increase KE.
1work is done by a force naa......sooo force actin on com mass na.....
106KE = mv2/2 ... KE of COM is always ZERO bcz COM is a point it has no mass.. mass is assumed to be concentrated there but actually no mass
1hey but change in KE is onli due 2 wrk done by net external forces actin on d body naa??