Question

First of the road the car is moving at speed rate of120kph . Next one hour and minutes 15 the car is moving at speed rate of64kph . What needs to be the speed rate for the rest of the road so that the speed rate of the whole trip would be 80kph if 1/6

of the road is left?

Answer 1

Step-by-step explanation:

Correct option is

B

10 s

u=144km/h=(144×

18

5

)m/s=40m/s

v=0

s=200m

By third equation of motion, v

2

=u

2

+2as

0=(40)

2

+2a(200)

−1600=400a

a=−4m/s

2

Now, by first equation of motion, v=u+at

0=40+(−4)(t)

−40=−4t

t=10sec

Answer 2

Answer:

correct answer is B