A truck has to carry a load in the shortest time from one station to another station
situated at a distance L from the first. It can start up or slowdown at the same
acceleration or deceleration a. what maximum velocity must the truck attain to satisfy
this condition?
(a) under root la
(b) under root 2La (c) under root 3La (d) under root 5La
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Answer:
(a) under root a
Explanation:
as the accelaration and declaration is same (a),
the train will start to accelarate till L/2and decelerate at L/2 to stop at L. So maximum speed will be at L/2 .
At L/2,
v² - u² = 2as
= v² - u² = 2aL/2
= v² = aL
= v = √aL
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