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```        Two particles 1 and 2 are thrown in the direction downward and upward with velocity 5m/s and 20m/s. Initially particle 1 is at height 20m from ground. Taking upward direction as positive direction.
Find (a)acceleration of 1 w.r.t 2
(b)Initial velocity of 2 w.r.t 1
(c)velocity of 1 w.r.t 2 after t=0.5s
(d)time when the particle will collide?```
7 years ago

510 Points
```										a) relative accleration of 1 wrt 2 is A12=g-(-g)=2g
b)velocity of 2 wrt 1 is U21=u2-u1=20-(-5)=25m/s
c)after 0.5 sec velocity of first is v1=-5-5=-10m/s
velocity of second is v2=20-5=15m/s
V12=V1-V2=-10-(15)=-25m/s
d)let distance travelled by particle in time t is -S1=-5t-5t^2
S1=5t+5t^2.....1
let distance travelled by particle 2 after time t is S2=20t-5t^2.......2
S1+S2=20
25t=20
t=4/5 sec
at t=4/5 sec particle will collide
```
7 years ago
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