A66.5-kg person throws a 0.0495-kg snowball forward with a ground speed of 30.5 m/s. a second person, with a mass of 59.5 kg, catches the snowball. both people are on skates. the first person is initially moving forward with a speed of 2.20 m/s, and the second person is initially at rest. what are the velocities of the two people after the snowball is exchanged?

First person (66.5kg) has a speed of 2.18 m/s

Second person(59.5kg) has a speed of 0.025 m/s

Explanation:

Assume the ball maintain constant speed of 30.5 m/s, neglecting air resistance. When the 1st person throw it, their momentum must be conserved before and after the throw

where m = 0.0495 kg, m1 = 66.5kg are the masses of the first person and the ball. v1 = 2.2m/s, V1, v = 30.5 m/s are the speed of the first person before, after, and the speed of the ball, respectively.

Similarly, the momentum for the 2nd person-ball system must be the same before and after the catch. Knowing that he is initially at rest:

where m2 = 59.5, v2 are the mass the speed of the 2nd person after the catch:

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it