A bullet fired vertically upward from a gun held 2.0m above the ground reaches its...

A bullet fired vertically upward from a gun held 2.0m above the ground reaches its maximum height in 4.0s. Calculate its initial velocity. (g=10m/s²)?

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Answers (5)

isaaq
3 weeks ago
At maximum height, the final velocity, v = 0
thus from v = u + at
0 = u - at
∴ U = at = 10 x 4 = 40 mls
EmX
2 weeks ago
At maximum height.
V=0
Dolly P
3 weeks ago
V=U+at
Since object is moving upwards,acceleration due to gravity will be negative;
V=U-gt
U=?
g=10ms-2
t=4sec
V=0
0=U-(10x4)
-U=-40
U=40m/s
Khalifah
3 weeks ago
Data: v=0 u=? g= 10m/s², h=2m t=4sec

Using v=ut-2gh
But at maximum height v=0
Therefore, 0=u×4-2(10×2)
0=4u-2×20
0=4u-40
Collecting like terms
0-4u=-40
-4u=-40
Divide both side by -4
-4u/-4=-40/-4
u=10m/s
Aliyu
3 weeks ago
Using v=ut-2gh
But at maximum height v=0
Therefore, 0=u×4-2(10×2)
0=4u-2×20
0=4u-40
Collecting like terms
0-4u=-40
-4u=-40
Divide both side by -4
-4u/-4=-40/-4
u=10m/s
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