A monkey in a perch 20 m high in a tree drops a coconut above the head of a zoo keeper as he runs with a speed 1.5 m/s beneath the tree actually intending to hit the toes of the zoo keeper, how early in seconds should the coconut be dropped by the monkey

Answer 1

time to fall= sqrt (2h/g)

distance to run=1.5*time

Answer 2

1.5 m