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Answers
Answer:
a) displacement b)speed
Answer:
answers are
(a).B area
(b).D acceleration
(c).A The object could continue moving at constant speed in a straight line
(d).C The direction of force on ball changes so the ball falls back to the ground
Explanation:
(a) displacement, velocity and force have both magnitude as well as direction but area has only magnitude . so by the definition of vector area is not a vector.
(b)scalar quantity is that which has only magnitude but not have direction. acceleration has both magnitude as well as direction. so it is not a scalar
(c) only A is false because the two forces are unequal so their resultant will never be zero. so the motion of particle can be accelerated, retarded or change its direction according to the resultant of the forces . but the particle will never move with constant speed in a straight line.
(d) 1st statement is correct as at a perticular height from the ground the magnitude of velocity of ball is same for its upward and downward direction
2nd one is also true because at the highest point the ball has zero velocity
3rd one is wrong as force is fixed and has downward direction
4th one is correct because acceleration in this case is due to gravity which has downward direction
Hope it will help you