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help with 5 part physics question?
A sling-shot is used to fire a marble vertically upwards at 20m/s.
a. What will be its velocity at its maximum height?
b. How long does it take to reach maximum height?
c. What is its maximum height?
d. What will be its velocity after 1.5s?
e. What will be its velocity after 3.0s?
a. zero
b Time to reach maximum height = (20-0)/9.8 = 2.04 s
c. Maximum height = (20^2)/(2*9.8) = 20.41 m
d. Velocity after 1.5 s = 20 - (9.8*1.5) = 5.3 m/s
e.Velocity after 3 s = 20 - (9.8*3.0) = -9.4 m/s [ i sign shows tha he mrble will be moving down with velocity 9.4 m/s
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