Question

Consider a child standing on a beach who gets hit by a wave. The child weighs 30 kg, and the portion of the wave that hits the child contained 60 kg water. If the wave had a period of 2 seconds and a wavelength of 6 meters, how fast will the child be moving after it is hit by the wave?

This is what I got so far:
v = w/T
v = 6/2
v = 3 m/s

p = m*v
p = 60*3
p = 180 kg m/s

m*v = p
30*v = 180
v = 180/30
v = 60 m/s

But the teacher says it's still wrong, can anyone help? Thanks!

Answer 1

does the water just stop or continue moving with the child?
it it continues moving on the child for an instant, you have 90 kg, not 30