1

0

Not always.

For each projectile particle, write the point on the curve.

Eg. ( Ux * t , Uy - at) and (Vx * t , Vy-a*t).

Disance between these two particles wil be calculated by using distance formula .

d = ((x2 - x1)^2 + (Y2- y1)^2 ) ^ 1/2

Now diffrentiate and put this function = 0 to find maxima / minima.

0

0

If

(1) the initial speeds are equal

(2) the angles of projections are unequal with one of them being >45 degrees

(3) the projectiles land on each others launching point

then,

the minimum distance between the rocks during their flight will be

**r** **min** **= d.[(1 - sin2θ) / 2]** **1/2** **= v** **2** **(sin2θ / g).[(1 - sin2θ) / 2]** **1/2 **

(calculated by steps written in previous answer)

here,

v = launch speed

θ = angle of projection of any one projectile

d = v2(sin2θ / g) = range of projectile