1.The average acceleration
2. The Newton's second law states
Hence
(a) "a=\\frac{20}{2}=10\\:\\rm m\/s^2"
(b) "a=\\frac{20}{4}=5\\:\\rm m\/s^2"
(c) "a=\\frac{20}{6}=3.3\\:\\rm m\/s^2"
3. The momentum
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