Question

Motion in a Straight Line
Two cars are moving in the same direction at the 5.
same speed u. The cars maintained a constant
distance x between them. An another car (third car)
coming from opposite direction meets the two cars
at an interval of t'. Then find the speed of the third
car
(1)xu (2)x/t
(3)u-x/t (4)(x/t)-u​

Answer 1

Answer:

Here we will apply relative concept let the speed of the car is u then relative speed of car with respect to car c is (u+30)

Distance is 5 kilometres

Time is 4minutes= 4÷ 60 hours

Speed= distance/ time

U+30= 5/4/60

U+30=5×60/4

On solving above equation we get

U+30 = 75 then u= 75 - 30= 45 km/h