onsider a cannon-ball of mass 8 kg fired vertically up from the ground with an initial speed of 120 m/s. We ignore the effects of air resistance. (a) Consider the downward trip. Find the work done by gravity when the cannon-ball drops from its highest point to halfway between the ground and the highest point. Hence, find the kinetic energy of the cannon-ball when it drops to the halfway point. (b) Mark a list that gives the kinetic energy, potential energy and the total mechanical energy at four points during the trip: when the cannon-ball (i) just leaves the cannon, (ii) reaches its highest point, (iii) is half-way in the downward trip, and (iv) is going to hit the ground.
Consider a cannon-ball of mass 8 kg fired vertically up from the ground with an initial speed of 120 m/s. We ignore the effects of air resistance.
(a) Consider the downward trip. Find the work done by gravity when the cannon-ball drops from its highest point to halfway between the ground and the highest point. Hence, find the kinetic energy of the cannon-ball when it drops to the halfway point.
(b) Mark a list that gives the kinetic energy, potential energy and the total mechanical energy at four points during the trip: when the cannon-ball (i) just leaves the cannon, (ii) reaches its highest point, (iii) is half-way in the downward trip, and (iv) is going to hit the ground.
Given
the mass of cannon-ball = m = 8 kg
the initial speed in upward direction = u = 120 m/s.
Ignore the effects of air resistance.
I have to find
(a) the work done by gravity when the cannon-ball drops from its highest point to halfway between the ground and the highest point. Hence, find the kinetic energy of the cannon-ball when it drops to the halfway point.
(b) Mark a list that gives the kinetic energy, potential energy and the total mechanical energy at four points during the trip: when the cannon-ball (i) just leaves the cannon, (ii) reaches its highest point, (iii) is half-way in the downward trip, and (iv) is going to hit the ground.
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