Two identical clocks, A and B, are initially syn-chronized at the bottom inside a vacuum chamber xed on the ground. Clock B is then kicked upward, and rise and fall under gravity only inside the chamber. Its maximum height is 1 meter (relative to clock A). Clock A stays at rest relative to the ground. When clock B comes back to the position of clock A, which clock's reading is larger? By how many femtoseconds? What if clock B reached a maximum height of 100 meters instead (still inside the chamber)? The gravitational acceleration is 9:8m=s2. Ignore e ffects of the spin of the earth.