Physic (Motion) Quick

2011-04-03 11:15 pm

This is a past test paper of my school,
Can any one help me finish it and check the questions I've done, THX!~

圖片參考：http://imgcld.yimg.com/8/n/HA00656648/o/701104030065713873406570.jpg

圖片參考：http://imgcld.yimg.com/8/n/HA00656648/o/701104030065713873406571.jpg
If it's too small you may save it and enlarge it, sorry for inconvenience brought.

回答 (1)

天同

2011-04-04 11:05 pm

✔ 最佳答案

1.(a) (i),(ii) and (iii). Your method seems correct, provided you have correctly count the "squares".(b) No, the relation is NOT always true. It is only true when X, Y and Z form a right-angle triangle, with XZ being the hypotenus.
3(a) The graph is a straight line passing through the origin and the point with coordinates (3, 33.3) [ because 120 km/h = 33.3 m/s]

4. (a) t = 1.55 s and t = 3.3 s. At these times, the curve cuts the time-axis.

(b) Find the area under the curve between the two times.

(c) The car accelerates non-uniformly until a top speed of about 0.3 m/s is reached. Then it deccelerates, agin non-uniformly, until it stops at t = 3.3 s

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