A Mass of 1

question 26

Multiple Choice

A mass of 1.35 kg rests on a frictionless floor and is attached to a wall with a 25.0-cm long spring with spring constant 1250 N/m.The mass is pulled back away from the wall to stretch the spring to a length of 34.5 cm.The mass is then released.The speed of the block when the spring returns to its original (unstretched) length is

• A)10.5 m/s.
• B)87.8 m/s.
• C)2.89 m/s.
• D)1.32 m/s.
• E)25.6 m/s.

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