Question

please help me it is very urgent
2 cars left place A simultaneously and reached the place B in 2 hrs . The first car travelled half the distance with a speed of 30 kmph and the other half with speed 45 kmph . The second car at the same time covered the entire distance with a constant acceleration starting from rest . Find the acceleration of the second car .

Answer 1

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$\huge{\bf{\blue {\fbox{\underline{\color{orange}{HELP.....YOU}}}}}}$First car reach half distance with 30 km/h
and next half distance with 45 km/h
time taken by 1st car in complete the motion = 2 hrs

Let S is the distance between AB
(S/2)/30 + (S/2)/45 = 2
S{ 1/60 + 1/90} = 2
S × 5 = 360
S = 72 km

now, use formula,
S = ut + 1/2at²
u = 0
S = 72 km
t = 2 hrs

72 = 1/2 × a × 4
a = 36 km/h²
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