6.
A car accelerates from rest with a uniform acceleration 2 ms-2 for some time.
Then brakes are applied to come to rest with a deceleration of 4 ms. If the
total time of travel is 15s, its maximum velocity in kmph is
b) 56
c) 60
d) 50
a) 72
Pl say the answer
Answers
Answered by
0
Answer:
Let v,t1,t2 be the maximum velocity attained, time for which car accelerated and the time for which car retarded respectively
⇒t1=(v−u)/a=(v−0)/2=v/2
⇒t2=(v−u)/a=(0−v)/(−4)=v/4
Now it is given that,
⇒t1+t2=3
⇒v/2+v/4=3
⇒v=4m/s
Hence correct answer is option C
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