After 4 second, a ball dropped from rest will have fallen 1.0 m 4.9 m 9.8 m 78.4

Question

After 4 second, a ball dropped from rest will have fallen 1.0 m 4.9 m 9.8 m 78.4 m 122.5 m A rifle bullet is fired horizontally at the same instant another bullet is allowed to drop same height. Which bullet strikes the first? The bullet from the rifle. The bullet allowed to drop Both strike at the same instant. Suppose you throw a ball vertically downward with a speed of 20 m/s. What would be the speed of the ball one second later? 9.8 m/s 10.2 m/s 29.8 m/s 40 m/s 98 m/s A man standing on a bridge throws a stone horizontally with a speed of 15 m/s. The stone hits the water below 4 s later. The height of the bridge is 44.1 m 60.0 m. 78.4 m 138.4 m At what horizontal distance does the stone hit the ground? 44.1 m 60.0 m 78.4 m 138.4 m

Explanation / Answer

9). As it will be constant acceleration under free fall, starting from rest, S= 1/2gt^2 = 0.5×9.8×4×4= 78.4 m. 4th option is correct.

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