Next week is my grandpa's n____ birthday, we're having a big party.
如图所示,B物体的质量是A物体质量的 12 ,在不计摩擦阻力的情况下,A物体自H高处由静止开始下落.以地面为参考平面,当物体A的动能与其势能相等时,物体距地面的高度是____.
Lisa is going to stay ______ with her grandparents on Saturday morning.