Force**
2006-12-29 7:24 am
A block of mass 5 kg rests on a smooth horizontal ground . A constant horizontal force of 5N is applied to the block for 2 seconds and is then removed .What is the speed of the block after 4s ?
回答 (1)
2006-12-29 7:30 am
✔ 最佳答案
F=ma5=5a
a=1m/s(square)
speed=2x1=2m/s
because the ground assume that no friction so the speed will constant and the speed will keep in 2m/s after 4s
收錄日期: 2021-04-27 12:39:06
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061228000051KK02794