Posted by **Willie** on Monday, September 21, 2009 at 8:03pm.

Two grenades, A and B, are thrown horizontally with different speeds from the top of a cliff 70 m high. The speed of A is 2.50 m/s and the speed of B is 3.40 m/s. Both grenades remain in air for 3.77 s. Assume that the acceleration due to gravity is 9.86 m/s^2. What is the distance between A and B if they are thrown along the same straight line?

- Physics -
**MathMate**, Tuesday, September 22, 2009 at 4:02pm
The horizontal distances are given by

Da(t) = 2.5t m

Db(t) = 3.4t m

Distance between A and B after 3.77 seconds is therefore

Distance = Db(3.77)-Da(3.77)

assuming the grenades are thrown in the same straight line *in the same direction.*

The acceleration due to gravity has no bearing on the distance between A and B, if air resistance can be ignored.

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