Question

94. A car accelerates from rest at constant rate for the A a car accelerates from rest at constant rate for first 10 s and covers a distance x. It covers a distance y in the next 10s at the same acceleration. Which of the following is true?
(1) x = 3y
(2) y = 3x
(3) x = y
(4) y = 2 x
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Answer 1

Answer

Using Newton’s equation of motion, at the end of first 10 seconds, we have

x=12a(10)2=50a

and

v=a(10)=10a

In the end of next 10 seconds, we have

y=10a(10)+12a(10)2

=100a+50a=150a

Hence, y=3x .