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A gun is fired vertically upwards from the top of an open truck moving horizontally, uniform velocity of 50ms-1. The bullet achieves a maximum height of 45 m

A gun is fired vertically upwards from the top of an open truck moving horizontally, uniform velocity of 50ms-1. The bullet achieves a maximum height of 45 m.
i) State with reason whether or not the bullet will land on the truck
ii) Calculate the distance covered by the truck just before the bullet reaches the level from which it was fired. (Use g = 10 ms-2)

Answers

John
i) The bullet will land on the track because it has the same horizontal velocity as the track.

ii) From S = ut + $\frac{1}{2}gt^2$

For a free fall u = 0, $

\rightarrow$ s = $\frac{1}{2}gt^2$

45 = $\frac{1}{2}$ x 10 x t2

t = 3 sec,

total time = 3 x 2 = 6 sec

Horizontal distance = v x t = 50 x 6 = 300 m
johnmulu answered the question on February 14, 2017 at 06:51

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