16.A body is acted upon by a constant force. What is the nature of the displacement-time graph?

17.From an elevated point A, a stone is projected vertically upwards. When the stone reaches a distance h below A, its velocity is double of what it was at a height above A. The greatest height attained by the stone is:

18.A particle moves 200 cm in the first 2 s and 220 cm in the next 4 s with uniform deceleration. The velocity of the particle at the end of 7s is:

19.A body is impaired motion rest to move in a straight line. If it is then obstructed, by an opposite force, then:

20.A car starts from rest requires a velocity v with uniform acceleration 2 m/second square then it comes to stop with uniform retardation 4 m/second square. If the total time for which it remains in motion is 3s, the total distance traveled is: