RELATIVE MOTION IN ONE DIMENSION -NUMERICALS

1.busses A and B Are moving in the same direction (along positive x axis) with speed 20m/s ans 15m/s respectively. the relative velocity of B With respect A in m/s is
2.On a two-lane road, car A is travelling with
a speed of 36 kmph. Two cars B and C
approach car A in opposite directions with
speed of 54 kmph each. At a certain instant,
when the distance AB is equal to AC, both
being 1 km, B decides to overtake A before
C does. What minimum acceleration of car
B is required to avoid an accident?
3.Delhi is at a distance of 200 km from Ambala. Car A sets out from Ambala at a speed of 30 km/hr. and car B
set out at the same time from Delhi at a speed of 20 km/hr. When will they cross each other ? What is the
distance of that crossing point from Ambala?
4. body is dropped from a height h above the ground. Find the ratio of distances fallen in first one second,
first two seconds, first three seconds, also find the ratio of distances fallen in 1st second, in 2nd second, in 3rd
second etc