A ball is dropped from a high rise platform at t = 0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t = 18 s. What is the value of v?
(Take g = 10 m/s²)

A bus is moving with a speed of 10 ms^$$-$$1 on a straight road. A scooterist wishes to overtake the bus in 100 s. If the bus is at a distance of 1 km from the scooterist, with what speed should the scooterist chase the bus ?

A particle starts its motion from rest under the action of a constant force. If the distance covered in first 10 seconds is S₁ and that covered in the first 20 seconds is S₂, then

A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 ms^$$-$$1 to 20 ms^$$-$$1 while passing through a distance 135 m in t second. The value of t is