4. (30 points) A block is given a quick hard show e so that just after the hand lets go, the block is starting up from the bottom of a 3-m-long friction-free ramp inclined at 40 degrees to the horizontal. The block is moving at a speed of 5m/s when it gets to the top of the ramp and moves into the air. 40 a) How fast was the block moving at the bottom of the ramp just after the hand let go? Show all your work as discussed in class