A block of mass m1 = 1.47 kg, initially moving to the right with a velocity of +3.90 m/s on a frictionless horizontal track, collides with a massless spring attached to a second block of mass m2 = 2.02 kg moving to the left with a velocity of  −2.46 m/s, as shown in Figure a. The spring has a spring constant of 5.83  102 N/m. (a) Determine the velocity of block 2 at the instant when block 1 is moving to the right with a velocity of +3.00 m/s, as shown in Figure b. (Indicate the direction with the sign of your answer.)   -1.805 m/s (b) Find the compression of the spring. 0.159 m   Use the values from PRACTICE IT to help you work this exercise. Consider the instant that block 2 is at rest. (a) Find the velocity of block 1. (Indicate the direction with the sign of your answer.) v1f =  m/s (b) Find the compression of the spring. x =  m

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