A boy jumps from a wall 3m high. What is an estimate of the change in momentum of the boy when he lands without rebounding?

Question

the answer is 5x10^2kg/ms, but how?

Answer 1

what's his mass?

momentum is ... m * v

his velocity is ... √(2gh) = √(2 * 9.8 * 3)

Answer 2

it didn't say:(

Answer 3

so the question is "estimating" his mass to be about 65 kg (143 lbs)
... a reasonable number

but a very poor question