[填空题]
An energy-absorbing car v )v vu+6ocpvg 5bg-s6bumper has a springk m7ctg,s :bsr:6f fy8 stiffness constant of 550 kN/m Find the maximum compression of the bumper if the car, with mass 1500 kg, collides with a wall,t8 gfmc7b :: ks6syfr at a speed of 2.2 m/s (approximately 5 mi/h). [Hint: Use conservation of energy.] m