9702/23/Nov/10 - Physic

[link318]

Can anyone help me with Q 4(c) ii? Why is g divided by 2?

and Q5(c) ii.
http://www.xtremepapers.me/CIE/International A And AS Level/9702 - Physics/9702_w10_qp_23.pdf

 

[yaogeorge]

by using s=1/2gt^2 ..
s=d =yaxis
t^2=x-axis..

1/2g =gradient..

 

[link318]

what about Q5(c) ii? can anyone help?

 

[MHHaider707]

what about Q5(c) ii? can anyone help?

change in potential energy = 0.024J, this energy is converted into strain energy of spring as shown in fig. 5.3

so maximum strain energy = 0.024 J
so, half of it is 0.024/2 = 0.012 J

when spring have maximum strain energy, extension is 2.6 cm....
so, by E= 1/2xkx^2, find the value of k!!
0.024=0.5xkx(0.026)^2 so k= 71

now when spring have half of its maximum strain energy extension = d

use the same equation, 0.012=0.5x71xd^2

Calculate d and it is equal to 1.8 cm.......