Carol starts moving from x to y at 6am at 50mph. Daid follows her at 10am and catches her at 3pm. What is davids average velocity?
回答 (1)
2016-06-21 10:08 am
Time taken from 6 am to 3 pm
= [(12 - 6) + 3] h
= 9 h
Time taken from 10 am to 3 pm
= [(12 - 10) + 3] h
= 5 h
Distance that Carol moves
= (50 miles/h) × (9 h)
= 450 miles
Distance that David moves
= 450 miles
David's average velocity
= (450 miles) / (5 h)
= 90 mph
= [(12 - 6) + 3] h
= 9 h
Time taken from 10 am to 3 pm
= [(12 - 10) + 3] h
= 5 h
Distance that Carol moves
= (50 miles/h) × (9 h)
= 450 miles
Distance that David moves
= 450 miles
David's average velocity
= (450 miles) / (5 h)
= 90 mph
收錄日期: 2021-04-18 15:27:00
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160621015846AAMpKX3