Two blocks, initially at rest, are each acted upon by the same net force over th

Question

Two blocks, initially at rest, are each acted upon by the same net force over the same interval in time. At the end of the interval, Block 1 is moving twice as fast as Block 2. Which of the following statements is true?

a.) Block 1 and Block 2 have the same kinetic energy at the end of the interval.

b.) The mass of Block 2 is twice the mass of Block 1.     

c.) The force of friction acting on Block 2 is greater than the force of friction acting on Block 1.

d.) The average force acting on Block 1 is twice as great as the average force acting on Block 2.

e.) The mass of Block 2 is half the mass of Block 1.

Explanation / Answer

a = F / m

and v = a t

v1 = (F / m1) t

v2 = (F / m2 ) t

v1 / v2 = m2 / m1

2v2 / v2 = 2 = m2 / m1

m2 = 2 m1

Ans(b)

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