A stationary 4-kg shell explodes into three pieces. Two of the fragments have a mass of 1 kg each and move along the paths shown with a speed of 10 m/s. The third fragment moves upward as shown.
-What is the speed of the third fragment?
A)zero m/s
B)1 m/s
C)5 m/s
D)10 m/s
E)20 m/s

Question

A stationary 4-kg shell explodes into three pieces. Two of the fragments have a mass of 1 kg each and move along the paths shown with a speed of 10 m/s. The third fragment moves upward as shown. 
-What is the speed of the third fragment?
A)zero m/s 
B)1 m/s 
C)5 m/s 
D)10 m/s 
E)20 m/s

Quizplus · Accepted Answer

The third fragment has a speed of 5 m/s because it is moving at the same speed as the second fragment, which is moving at 5 m/s.

A Stationary 4-Kg Shell Explodes into Three Pieces