سفيرالعرب
10-22-2007, 07:23 PM
يا شباب المنتدى العامر باهله ارجوكم تساعدوني بهذا السؤال
a parachutist throws a stone vertically upward with speed of 12 m/s relative to himself . at the instant he throws the stone he is 120 m high and falling at 4 m/s how long does it take the stone to reach the ground ?
a parachutist throws a stone vertically upward with speed of 12 m/s relative to himself . at the instant he throws the stone he is 120 m high and falling at 4 m/s how long does it take the stone to reach the ground ?