1. Một khối trụ đặc đồng chất, khối lượng m= 0,5kg bán kính R bắt đầu lăn không trượt từ đỉnh một mặt phẳng nghiêng dài 2m, góc nghiêng α. Biết vận tốc dài của tâm trụ đặc khi lăn đến chân mặt phẳng nghiêng là v=2spr2 m/s, mômen quán tính của khối trụ I=mR^2/2 /2. Hãy tính:
a, Gia tốc của tâm khối trụ và góc nghiêng α.
b, Công và công suất trung bình của trọng lực trong quá trình chuyển động

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