Question

please explain your answer​

Answer 1

Answer:

$s= ut-\frac{1}{2}{gt^2}$

Since we are considering downward direction, s will be negative, u is upwards so u is positive.

$-s=29(10)-5(100)\\-s=290-500\\-s=-210\\s=210m$

Remember friend, this equation doesn't trace the projectile, just its displacement from earth.