问题标题：
【Youthrowaballstraightupintheair.Theinstantafterleavingyourhandtheball’sspeedis3Youthrowaballstraightupintheair.Theinstantafterleavingyourhandtheball’sspeedis30m/s.Ignoringtheeffectsofairresistance,predict】
问题描述：
Youthrowaballstraightupintheair.Theinstantafterleavingyourhandtheball’sspeedis3
Youthrowaballstraightupintheair.Theinstantafterleavingyourhandtheball’sspeedis30m/s.Ignoringtheeffectsofairresistance,predicthowfasttheballistraveling2secondslater?Whereisitatthistime?
柯新回答：
First,accordingto
S=V0*t-1/2gt*2(1)
Tentakethedatato(1)
Youcanaccesstotheanswereasily,
S=40meters
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