ǁ A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at 20.0 m/s upward? (b) At what time is it moving at 20.0 m/s downward? (c) When is the displacement of the boulder from its initial position zero? (d) When is the velocity of the boulder zero? (e) What are the magnitude and direction of the acceleration while the boulder is (i) moving upward? (ii) moving downward? (iii) at the highest point? (f) Sketch graphs of a , vs t , u. vs t , and y vs z .
ǁ A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at 20.0 m/s upward? (b) At what time is it moving at 20.0 m/s downward? (c) When is the displacement of the boulder from its initial position zero? (d) When is the velocity of the boulder zero? (e) What are the magnitude and direction of the acceleration while the boulder is (i) moving upward? (ii) moving downward? (iii) at the highest point? (f) Sketch graphs of a , vs t , u. vs t , and y vs z .
ǁ A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at 20.0 m/s upward? (b) At what time is it moving at 20.0 m/s downward? (c) When is the displacement of the boulder from its initial position zero? (d) When is the velocity of the boulder zero? (e) What are the magnitude and direction of the acceleration while the boulder is (i) moving upward? (ii) moving downward? (iii) at the highest point? (f) Sketch graphs of a, vs t, u. vs t, and y vs z.
A tennis ball is initially near the ground, and it's thrown vertically upward with an initial velocity of 17.5 m/s.
a) When it reaches a height of 10 meters (not its maximum height), what is its velocity?
b) How long does it take to reach the height of 10 meters?
c) What is its maximum height?
A large boulder is ejected vertically upward from a volcano with an initial speed of 40.8 m/s. Air resistance may be ignored.
A) At what time after being ejected is the boulder moving at a speed of 19.0 m/s upward?
B) At what time is it moving at a speed 19.0 m/s downward?
C) When is the displacement of the boulder from its initial position zero?
D) When is the velocity of the boulder zero?
A long jumper leaves the ground at an angle of 17.0° to the horizontal and at a speed of 10.9 m/s.
(a) How long does it take for her to reach maximum height? s(b) What is the maximum height? m(c) How far does she jump? (Assume that her motion is equivalent to that of a particle, disregarding the motion of her arms and legs.) m
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