A painter on a scafford drops a 1,5 kg can of paint from a height of 6 m.a. what is kinetic energy of the can when it is at a height of 4 m?b. what speed will the can hit the ground? (neglect air resistance)
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Jawaban:
a. 30 Joule
b. 20 akar 3 m/s
Penjelasan:
Diketahui :
m = 1,5 kg
h = 6 m
Ditanyakan :
a. EK pada 4 m .. ?
b. v .. ?
Jaweb :
mencari kecepatan pada 4 meter
v^2 = v0^2 + 2gh
v^2 = 0^2 + 2(-10)(4-6)
v^2 = 0 + (-20)(-2)
v^2 = 40
v = 2 akar 10 m/s
mencari energi kinetik
EK = 1/2mv^2
EK = 1/2(1,5)(2akar10^2)
EK = 1/2(1,5)(40)
EK = 30 Joule
mencari kecepatan ketika menyentuh tanah
v^2 = v0^2 + 2gh
v^2 = 0^2 + 2(-10)(-6)
v^2 = 0 + 120
v = 20 akar 4 m/s
Jika ada pertanyaan lain, bisa dm @sastrasains.id atau @m.adhesi
Terimakasih ...
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