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Từ độ cao 20m, người ta ném hòn đá nặng 196g với vận tốc đầu 72km/h, dưới góc ném 25°, cho gia tốc trọng trường g = 10m/s2. Hãy xác định:
a. Phương trình chuyển động – phương trình quỹ đạo của chất điểm.
b. Thế năng của hòn đá ở độ cao cực đại.
c. Động năng của hòn đá sau khi ném 1s.
d. Động năng của hòn đá khi chạm đất.
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Từ độ cao 20m, người ta ném hòn đá nặng 196g với vận tốc đầu 72km/h, dưới góc ném 25°, cho gia tốc t...
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