Questions
Two particles having position vectors meters and meters are moving with velocities and . If they collide after 2 seconds, the value of is
detailed solution
Correct option is D
It is clear from figure that the displacement vector Δr→ between particles p1 and p2 is Δr→=r2→−r1→=−8i^−8j^ |Δr→| =(−8)2+(−8)2=82 …..(i)Now, as the particles are moving in same direction (∵ v1→ and v2→ are +ve), the relative velocity is given byv→rel=v2→−v1→=(α−4)i^+4j^v→rel=(α−4)2+16 …..(ii)Now, we know |v→rel| =|Δr→|tSubstituting the values of v→rel and |Δr→| from equation (i) and (ii) and t=2s, then on solving we get α=8Similar Questions
A sphere collides with another sphere of identical mass. After collision, the two spheres move. The collision is inelastic. Then the angle between the directions of the two spheres is
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