Answer on Mechanics | Relativity Question for sharif ibrahim
(a) What is the Stone's velocity as it hits the ground?
(b) What is the maximum height of the stone?
(c)What is the stone's kinetic energy when the gravitational potential energy is 30% less than when it started?
(d) What is the stone's gravitational potential energy 1.0 s before it touches the ground?
a) When the stone hits the ground it`s the gravitational potential energy is equal zero, so let`s use the law of energy conservation:
b) The maximum height of the stone is achieved when the stone`s kinetic energy is equal zero. So let`s use the law of energy conservation:
c) Let`s use the law of energy conservation:
d) We need use the time of the fall
a) 42.8 m/s
b) 93.4 m
c) 40.1 kj
d) 39.2 kj
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