Thursday

August 21, 2014

August 21, 2014

Posted by **Genevieve** on Saturday, July 29, 2006 at 11:19pm.

thank you very much

The teacher's head is H = 18.0 - 1.7 = 16.3 m below the window from which the water balloon is dropped. The time required to fall that distance is

t = sqrt(2H/g) = 1.82 s.

The teacher moves horizontally

t*0.45 m/s = 0.82 m in that time. If he was 1.0 m behind the impact point when it was dropped, he will be 0.18 m behind the impact point when the water balloon reaches the height of his head.

That's pretty close. You need to consider the finite size of the water balloon and the person before deciding on an answer. The teacher will have moved even closer to the balloon before it hits the ground.

I would say the water balloon would barely miss his head but probably hit his forward-extended leg before it hits the ground.

**Related Questions**

physics - In the figure below, a student at a window on the second floor of a ...

physics - In the figure below, a student at a window on the second floor of a ...

University Physics - Building A and Building B are 30m away from each other, on ...

Math - A man on the 8th floor of a building sees a bucket (dropped by a window ...

Trigonometry (Math) - A ladder 42 feet long is place so that it will reach a ...

Physics - A student at a window on the second floor of a dorm sees his moth ...

physics - an object is dropped from the window of an apartment in a high rise ...

geometry - Two buildings are separated by an alley. Joe is looking out of a ...

Physics - A student sees a flowerpot pass his 2m high window on the fourth floor...

math - A steel ball is dropped from rest from the roof of a building. An ...