00427 a2200145 4500020001500000082001600015245005300031260004500084300001500129650002100144650006000165650001200225650002000237650002400257 a0335163262 a531.14bOPE aUnit 3 motion under gravityba scientific theory aColombobThe Open Universityc1994g1994 a38p.c29cm aMass and gravity aDynamics, statics, mass and gravity, particle meehanics aPhysics aSolid meehanics aClassical meehanics