Question

3A ball rolls off a 1.0 m high table with a speed of 4.0 m/s, as shown in the figure below. Calculate the speed as the ball strikes the floor:

4.0 ms¹
1.0 m

Answer 1

Vy = g T where T is the time taken to fall

1 = 1/2 g T^2 time to fall 1 m

T = (2 / 9.8)^1/2 = .45 sec

Vy = 9.8 * .45 = 4.43 m/s

V = (Vx^2 + Vy^2)^1/2 = (16 + 19.6)^1/2 = 5.97 m/s

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