A 25-kg block is connected to a 30-kg block by a light string that passes over a

Question

A 25-kg block is connected to a 30-kg block by a light string that passes over a frictionless pulley. The 30-kg block is connected to a light spring of force constant 165 N/m, as in the figure below. The spring is unstretched when the system is as shown in the figure, and the incline is smooth. The 25-kg block is pulled 21 cm down the incline (so that the 30-kg block is 41 cm above the floor) and is released from rest. Find the speed of each block when the 30-kg block is 20 cm above the floor (that is, when the spring is unstretched).

**ANSWER IN m/s

A 25-kg block is connected to a 30-kg block by a light string that passes over a frictionless pulley. The 30-kg block is connected to a light spring of force constant 165 N/m, as in the figure below. The spring is unstretched when the system is as shown in the figure, and the incline is smooth. The 25-kg block is pulled 21 cm down the incline (so that the 30-kg block is 41 cm above the floor) and is released from rest. Find the speed of each block when the 30-kg block is 20 cm above the floor (that is, when the spring is unstretched). **ANSWER IN m/s

Explanation / Answer

Gravity is causing the blocks to move

Workgravity =          FNet                 ?x

Workgravity = (30g

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