Multiple choice: Choose the best answer. Note that your answers may not be exactly the same due to the rounding error, so just choose the closest one. Also, you need to turn in the work sheets to get partial credits. Box the answers for non-multiple choice questions. A 10 kg block is released from point A, The track is frictionless except for the portion between B and C which has a length of 3.0 meters. The block travels down the track, passes through BC and first collides with a small block m (mass is 2 kg), then they travel together and later hit the spring. A M 4m a. 4.5 m/s No friction Not b.-235 J c. 8.85 m/s c. 4.7 m/s B c. 6.5 m/s ***** friction } 3.0m 1. find the velocity of the block when it reaches point B the bottom of the track. a. 7.67 m/s b. 5.43 m/s d. 10.8 m/s 2. find the work done by friction between BC if the coefficient is 0.300. W = ? a.-125 J c.-88.2 J d. - 147 J 3. use energy conservation Wr=E.- Es to solve the velocity of the block M after it passes through BC. a. 7.8 m/s b. 3.4 m/s