M1 problem

[anonymous123]

AoA wr wb
9709_s10_qp_43
Q6 part ii
Explanation plz...

 

[littlecloud11]

AoA wr wb
9709_s10_qp_43
Q6 part ii
Explanation plz...

Basically you use the formula s= ut= 1/2 at^2, as you only know the initial velocities of the particles and the acceleration.
you obtain two different equations for P and Q and then equate them.

for P,
s= 0 + 1/2 * 1.75* (t+2)^2
The question says P starts frm rest and you already knw the acceleration frm the previous part, P has traveled 2 sec more thn Q as Q started moving 2 sec after P. so the time here is (t+2)^2

equation for Q,
s= 0 + 1/2 * 1.75 * t^2
again Q starts frm rest, and the value of acceleration is same as P as it moves on the same plane and there was no initial force applied.

then you equate them,
Sp- Sq= 4.9
and solve to get the answer!

hope you got it. =)