An impala is an African antelope capable of a remarkable vertical leap. In one recorded leap, a \(45 \mathrm{~kg}\) impala went into a deep crouch, pushed straight up for \(0.21 \mathrm{~s}\), and reached a height of \(2.5 \mathrm{~m}\) above the ground. To achieve this vertical leap, with what force did the impala push down on the ground? What is the ratio of this force to the antelope's weight?