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Mechanics AS help!

Thanks in advance.

A particle P is projected vertically upwards from a point O with a speed 12m/s. One second after P has been projected from O, another particle Q is projected vertically upwards from O with speed 20m/s. Find the time between the instant that P is projected from O and the instant when P and Q collide.

This question I genuinely have no ieda.

Reply 1

Neofytos

x=ut +1/2at^2
x1=12t+1/2(9.8)t^2=12t1+4.9t1^2 (1)
x2=20t+1/2(9.8)t^2=20t2+4.9t2^2 (2)
t2=t1+1
(2)=>x2=20(t1+1)+4.9(t1+1)^2=.......

When they will meet they will have made the same distance: =>(1)=(3)

=>12t1+4.9t1^2=(3) ....... And u find the result :P