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srishty sharma Grade:
        

a parrticle A is projected vewrtically upwards . another particle B of same mass is prijected at an angle 45 .both reach at same height . the ratio of intial kinetic energy of A to B ?

6 years ago

Answers : (2)

Puneet Mittal AskiitiansExpert-IITD
22 Points
										

Hi Srishty,


Let Initial speeds of A be Va and of B be Vb.


let height be h.


Thus 2gh = (Va)    and  (Vb(sin45))2 = 2gh


Thus, (Va)2 = (Vb)2*(1/2)


Thus, (Va)2/(Vb)2  = 1/2


The ratio of Initial Kinetic energies of A and B is 1/2 because they have same Mass.


Please feel free to ask as many questions you have.


Puneet

6 years ago
Karthik Eyan
45 Points
										

For a 1 D motion,


H max = u^2/2g


In an oblique projection, H max = v^2 sin^2 (angle) / 2g


Here heights are same.


So :u^2 = v^2 sin^2(45)


u^2 / v^2 = 1


So, ratio of internal KE is 1:1 as masses are same........

6 years ago
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