M1 math

[ahmed t]

http://www.xtremepapers.net/CIE/International A And AS Level/9709 - Mathematics/9709_s09_qp_4.pdf
first question how is the tension 40

 

[DragonCub]

In this case the tension is just P's weight, 40N
How is it not 40???

 

[hassam]

u shud consider the particle p only for calculating tension NOT b cos in B there is normal reaction force also..so since P is not moving its weight shud equal the tension

 

[ahmed t]

yea i totaly forgot about the reaction force in B so i got the wrong anser. thanks