physics momentum 問題急

2011-01-15 3:17 am

A hockey puck moves towards a hockey player from the right at 15 ms^-1.The player targets at the opponent's net and applies an average force of 80 N to the puck for 0.10s. The mass of a puck is 0.25 kg.

Find the speed of the puck after impact.

thx~

更新1:

@天同對不起可能我沒有加上graph http://i220.photobucket.com/albums/dd316/christopher2018/a.png 希望你能解答這個問題謝謝

回答 (1)

天同

2011-01-15 3:56 am

✔ 最佳答案

Use the relation: impulse = change of momentum
hence, 80 x 0.1 = 0.25 x (v - (-15))where v is the final velocity of the pucksolve for v gives v =17 m/s

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收錄日期: 2021-04-29 17:38:51
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110114000051KK01035

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physics momentum 問題 急

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physics momentum 問題急