A 78-kg test "dummy" crashes into a wall at 14 m/s and is brought to rest in 0.10 s What is the magnitude of the average force exerted by the wall on the “dummy”?
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Ответ:
12.7m/s
Explanation:
Given parameters:
Mass of the diver = 77kg
Height = 8.18m
Unknown:
Final velocity = ?
Solution:
To solve this problem, we use one of the motion equations.
v² = u² + 2gh
v is the final velocity
u is the initial velocity
g is the acceleration due to gravity
h is the height
v² = 0² + (2 x 9.8 x 8.18)
v² = 160.3
v = 12.7m/s