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An attacker at the base of a castle wall 3.62 m high throws a rock straight up with speed 7.50 ms at a height of 1.38 m above the ground will the rock reach the top of the wall?
Wiki User
∙ 12y ago
v = vo + at
0 = 7.5 m/s -(9.8 m/s^2)t
(9.8m/s^2)t = 7.5m/s (divide both sides by 9.8 to solve for t)
t = 0.765 s
max height = vot = 1/2at^2
max height = (7.5 m/s)(0.765 s) - (4.9m/s^2)(0.585s^2)
max height = 5.74 m - 2.87 m
max height = 2.87 m
2.87 + 1.38 = 4.25 m (you are adding the height above the ground here)
4.25 m is higher than the height of the castle wall (3.62 m) therefore the rock will reach the top of the wall.
Wiki User
∙ 12y ago
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