## Q1 The equation of motion for the freely dropped body under gravity is

• (a)v^{2}  = 2ah
• (b) v^{2}  = -2gh
• (c) v^{2}  = -2ah
• (d) v^{2}  = 2gh

• (d) v^{2}  = 2gh

## Q2 The stopping distance 'S' of a vehicle who is moving with initial velocity 'u'

• (a) S= \frac{u^{2}}{2a}
• (b) S= \frac{a^{2}}{2u}
• (c) S= \frac{-u^{2}}{2a}
• (d) None of these

• S= \frac{-u^{2}}{2a}

## Q3  The ratio of the distance travel by a body falling freely from rest in first, second and third second of its fall is:-

• (a)2 : 3 : 5
• (b) 1 : 3 : 5
• (c) 5 : 3 :1
• (d) 3 : 5 : 1

• (b) 1 : 3 : 5 ( u=0, use formula h_{nth}= u+\frac{g}{2}(2n-1)

• (a)7.5s
• (b) 5.7s
• (c) 6.2s
• (d) 6.9s

• (c) 6.2s

• a) True
• b) False

• a) True

• a) True
• b) False

• b) False

## Q7  For a normal person, the reaction time is

• a) \frac{1}{15}s
• b) \frac{1}{50}s
• c) \frac{1}{10}s
• d) 0 s

• a) \frac{1}{15}s

• a) True
• b) False

• b) False

## Q9.  The time interval between seeing a child and pressing the brake is known as

• a) Reaction time
• b) stopping time
• c) parallactic second
• d) None of these

• a) Reaction time

## Q10 .......acceleration is called deceleration

• a) +ve acceleration
• b) -ve acceleration
• c) zero acceleratio
• d) All of above

• b) -ve acceleration 