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Two particles 1 and 2 are thrown in the ...

Two particles 1 and 2 are thrown in the directions shown in figure simultaneously with velocities `5 m//s and 20 m//s.` Initially, particle 1 is at height 20 m from the ground. Taking upwards as the positive direction, find

(a) acceleration of 1 with respect to 2
(b) initial velocity of with respect to 1
(c) velocity of 1 with respect to 2 after time `t= 1/2 s`
(d) time when the particles will collide.

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