motion in straight line qn (1 Viewer)

[Masaken]

hey all, how would you do c and d? many thanks in advance
(i've done a and b, and the answers are: for part a 50km/h for Car A and 20km/h for Car B, and for part b the answer is 9 minutes (t = 0.15)

 

[ExtremelyBoredUser]

View attachment 35797
hey all, how would you do c and d? many thanks in advance
(i've done a and b, and the answers are: for part a 50km/h for Car A and 20km/h for Car B, and for part b the answer is 9 minutes (t = 0.15)

For (c), simply equate A and B as Q is a point the cars reach at the same time.






hence point Q is (sub in either equation);
from O

For (d) at t = 0, x = 2 and at t = 0.3, x = 13.2:

Trying to find the velocity of the car (note: we can only use these "suvat" equations as speed is uniform, does not work for non-uniform speed):



and as this is uniform speed (meaning velocity will be constant), the general equation:

 

[Masaken]

thank you!!