A 40-Kg Block Slides Along a Frictionless Surface with a Constant

question 13

Multiple Choice

A 4.0-kg block slides along a frictionless surface with a constant speed of 5.0 m/s as shown. Two seconds after it begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed eight seconds later. The graph shows how the force on the block varies with time.
-What, approximately, is the speed of the block at t = 11 seconds?

• A)5.0 m/s
• B)16 m/s
• C)25 m/s
• D)65 m/s
• E)75 m/s

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