Consider a 5-kg block moving up a 45 incline with an initial speed of 7 m/s. At the end of the ramp is a spring initially relaxed as shown below. The spring constant is 100 N/m. The distance that the block moves up just before touches the spring is d = 1.6 m. When the block momentarily comes to rest due to the spring, the spring is compressed by 0.4 m. Use 9.81 m/s2 for the gravitational acceleration. 0 www (a) (1 point) Is the contact surface between the block and the ramp frictionless? Yes or No? (b) (2 points) What is the reason for your answer in (a)? (c) (2 points) If your answer in (a) is yes, what is the increase in thermal energy in the block and the ramp? Round your answer to two decimal places. (d) (3 points) What is the speed at which the block just touches the spring? Round your answer to two decimal places.