On an ice skating rink, a girl of mass 50 kg stands stationary, face to face with a boy of mass 80 kg. the children push off of one another, and the boy moves away with a velocity of +3 m/s. what is the final velocity of the girl? –1.9 m/s +1.9 m/s –4.8 m/s +4.8 m/s

- 4.8 m/s option (c)

Explanation:

Let the girl moves with velocity u.

mass of girl, m = 50 kg, u = ?

mass of boy, M = 80 kg, U = + 3 m/s

Use the conservation of momentum

momentum before pushing = momentum after pushing

0 = m x u + M x U

0 = 50 x u + 80 x 3

- 240 / 50 = u

u = - 4.8 m/s

the answer is d

explanation:

dan realized that his goal of going to an ivy league school if only he works hard which means basically this   to become completely aware of (something) as a fact; understand without a doubt to make (something desired or anticipated) occur to give real, definite or physical form to a plan, dream, or goal to earn (money or a profit) from a deal

volume: 22

density: 7.04