Fill in the blanks.     (4- marks )
    (a) Displacement is defined as the distance travelled along a _____ direction.
    (b) Energy is the _____ to do work.
    (c) The normal temperature is _____ ℉.
    (d) The ice point is 0℃ in celsius scale and _____ K in kelvin scale.

3. In the equation s =v0t + 1/2at2 ,s,v0 and a  are magnitudes of the respective vector quantities.
    Write down the equation in vector form.
     A vector of magnitude 5 units is inclined at an angle 37° to the x  axis . Find the magnitudes
    of the vector components along   x    and    y   axis.   ( 5- marks )

4. Which of the following quantities are scalars and which are vectors?
     (a) speed (b) velocity  (c) average velocity  (d) acceleration  (e) displacement.
    A particle starting from rest moves along a straight line with a constant acceleration of 2 ms-2.
    What is the velocity of the particle 9 s after it started from rest?   ( 5- marks )

SECTION (B)
Answer ALL Questions
Answer any FOUR Questions

5. (a) Is work a vector or scalar? Define “energy”. A wooden sphere of mass  0.15 kg is  thrown 
     with a velocity of 30 ms-1 .Find the kinetic energy of the sphere.   (4-marks )
    (b) Define “work” . Write down the unit of work in SI system. A woman push a child, who is
     riding a tricycle, with a 200N force. The tricycle moves a distance of 2m and the  work done 
     by the woman is 100J. Find the angle between the force and the displacement.    (4-marks )

6. (a) Define speed and vel   (4-marks )
    (b) A body moving with a constant acceleration reach the velocity 4ms-1 after 10s. If the
     body start  from rest ,   find the velocity after   (a) 12s    (b) 14s   (c)  16s   (d) 18s.  Draw the
     velocity time  graph for  the interval  10 s to 18 s. From  the graph  ,   find  the    velocities at 
    8s  and  20s.              (4marks )
                                                                                                                                          P.T.O →

     

7. (a) State law of conservation of momentum.                                                     ( 4 marks )
    A 30g bullet moving at a constant velocity hits  a  wooden   block of mass 3kg and continues
    to travel at  the velocity of  2 ms-1  together with the block.   What is the velocity of the bullet
    when it hits the block?
   (b)A 0.2kg  marble is at rest on a  smooth  table.    Another marble of mass 0.1 kg   moving at 
    a  constant  velocity  of  10 ms-1  towards the east  hits  this marble  and  it recoils to the west 
    with the velocity of 5ms-1. Find the velocity of the marble which was at rest? ( 4 marks )

8. (a) In order to weight a body in the laboratory,  a  uniform  plank of wood AB  3 m  long and  
     having a mass of 8kg is pivoted  about a point 0.5 m from   A.   The boy stands 0.3m from A
     and   a  mass of 2 kg is placed 0.5m from B in   order to   balance   the