A Roller Derby Exhibition recently came to town. They packed the gym for two

consecutive weekend nights at South's field house. On Saturday evening, the

68-kg Anna Mosity was moving at 17 m/s when she collided with 76-kg Sandra

Day O'Klobber who was moving forward at 12 m/s and directly in Anna's path.

Anna jumped onto Sandra's back and the two continued moving together at

the same speed. Determine their speed immediately after the collision.

Question

Physics

Pickle

10 June, 07:01

A Roller Derby Exhibition recently came to town. They packed the gym for two

consecutive weekend nights at South's field house. On Saturday evening, the

68-kg Anna Mosity was moving at 17 m/s when she collided with 76-kg Sandra

Day O'Klobber who was moving forward at 12 m/s and directly in Anna's path.

Anna jumped onto Sandra's back and the two continued moving together at

the same speed. Determine their speed immediately after the collision.

+3

Answers (1)

Know the Answer?

Cohen · Answer 1

14.36m/s

Explanation:

From the law of conservation of linear momentum

m1u1 + m2u2 = v (m1 + m2)

68*17 + 76*12 = v (68+76)

1156+912 = 144v

2068 = 144v

v = 2068/144

=14.36 m/s