First slide

The 3 equation for uniform acc

Question

A car travelling with a speed 126 KMPH along a straight line comes to rest after travelling a distance 245 m with uniform retardation. The time taken by the car to come to rest, in second is

Moderate

A

11
B

12
C

16
D

14

Solution

$\large s = \left( {\frac{{u + v}} {2}} \right)t$
$\large 245 = \left( {\frac{{126 \times \frac{5} {{18}} + 0}} {2}} \right)t$
$\large t = \frac{{2 \times 245 \times 18}} {{126 \times 5}}$
t = 14 seconds

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