Push-Away Problems With Energy Video Lessons

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Problem: Two blocks are at rest on a horizontal frictionless surface with a compressed spring of negligible mass between them. Block A has mass 2.00 kg and block B has mass 5.00 kg. The blocks are released from rest and move off in opposite directions, leaving the spring behind. If block B has speed 0.800 m/s after it leaves the spring, what is the speed of block A after it leaves the spring? (Block A is the less massive block.) (a) 0.63 m/s (b) 0.95 m/s (c) 1.00 m/s (d) 1.26 m/s (e) 1.50 m/s (f) 2.00 m/s (g) none of the above answers

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Problem Details

Two blocks are at rest on a horizontal frictionless surface with a compressed spring of negligible mass between them. Block A has mass 2.00 kg and block B has mass 5.00 kg. The blocks are released from rest and move off in opposite directions, leaving the spring behind. If block B has speed 0.800 m/s after it leaves the spring, what is the speed of block A after it leaves the spring? (Block A is the less massive block.)

(a) 0.63 m/s

(b) 0.95 m/s

(c) 1.00 m/s

(d) 1.26 m/s

(e) 1.50 m/s

(f) 2.00 m/s

(g) none of the above answers

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