A ball is thrown horizontally with a speed of 10.0m/s, from the edge of the top

Question

A ball is thrown horizontally with a speed of 10.0m/s, from the edge of the top of a building of height 19.6m, and later strikes the (level) ground. (Neglect air friction.)


1.   For how long was the ball in the air? 2. What is the vertical component of the velocity just before the ball strikes the ground? 3.   What is the horizontal component of the velocity just before the ball strikes the ground? 4.   How far from the base of the building did the ball strike the ground? 5.    What is the speed of the ball just before it strikes the ground? A ball is thrown horizontally with a speed of 10.0m/s, from the edge of the top of a building of height 19.6m, and later strikes the (level) ground. (Neglect air friction.)


1.   For how long was the ball in the air? 2. What is the vertical component of the velocity just before the ball strikes the ground? 3.   What is the horizontal component of the velocity just before the ball strikes the ground? 4.   How far from the base of the building did the ball strike the ground? 5.    What is the speed of the ball just before it strikes the ground?

Explanation / Answer

Ans 1) Time = (2h/g)^0.5 = 2 sec

Ans 2) v = 0-g*t = -19.6 m/sec

Ans 3) Uf = 10 + 0 = 10 m/sec

Ans 4) distance = speed*time (since the acceleration is zero

Distance = 20 m

Ans 5) Speed = (100+19.6^2)^0.5 = 22.0036 m/sec

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