A car undergoes uniform deceleration along a straight road. Its velocity decreases from 30ms-1 to 20ms-1 after traveling a distance of 100m. How much further will the car travel before it comes to a rest?
A. 50m
B. 80M
C. 180m
D. 200m
E. 300m
how to calculate?
phy mc qs(ERGENT)
2007-04-24 10:20 pm
回答 (1)
2007-04-24 10:27 pm
✔ 最佳答案
USE" v^2=u^2+2as"20^2=30^2+2a(100)
a= -2.5 m s^-2
use" v^2=u^2+2as"
0=20^2+2(-2.5)s
s=80 m
ans.b
收錄日期: 2021-04-25 14:13:01
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