A student must determine the effect of friction on the mechanical energy of a small block as it slides up a ramp. The block is launched with an initial speed o from point A along a horizontal surface of negligible friction. It then slides up a ramp, where friction is not negligible, that is inclined at angle with respect to
the horizontal, as shown in the figure. The student measures the maximum vertical height h attained by the block while on the ramp, labeled as point in the
figure. At point B, the block comes to rest. The student performs three trials with the ramp at different angles, launching the block at the same initial speed vo
for each trial. The results from the trials are displayed in the table.
Consider the trial with the 45 ramp. Suppose the block is launched up the ramp such that it comes to rest at point B and then travels down the ramp. Which of
the following best describes the block's kinetic energy K A when it again reaches point A at the bottom of the ramp in comparison to the initial kinetic energy
Ko before it travels up the ramp?