[单选题]
A roller coaster startstop7e8lbkp (3nzh ;e0 at a point 30 m aboi u 2 wwlc4-sjpnv5/p)ve the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 4/-j5iplvw 2p4ucnw s) 5 m above the bottom of the dip?
