A) \[d=150,t=5\]
B) \[d=120,t=8\]
C) \[d=180,t=6\]
D) \[d=90,t=6\]
Correct Answer: D
Solution :
Given: mass of car m = 1000 kg u =30m/s v = 0 m/s retarding force f = 5000 N \[\therefore \]retardation, \[-a=\frac{5000}{1000}=5\,m/{{s}^{2}}\] By equation, \[{{v}^{2}}-{{u}^{2}}=2as\] \[0-{{(30)}^{2}}=-2\times 5\times d\] \[\therefore \]\[d-\frac{900}{10}=90m\] and\[a=\frac{v-u}{t}\therefore t=\frac{v-u}{a}=\frac{0-30}{-5}=6s\]
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