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CBSE Class 12-science Answered

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Asked by jain.pradeep | 24 May, 2019, 10:57: PM
answered-by-expert Expert Answer
(3) distance S from starting point of an object moving with constant positive acceleration a
 
S = (1/2)at
 
If a = 2 unite, then S = t2 .................. (1)
 
Numbers in set-C matching this eqn.(1)
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(4) Speed of an object acted upon by a constant force opposite in direction to its velocity.
    v = u - (f/m)×t .................(2)
where v is speed at instant of time t , u is initial speed, f is force and m is mass so that f/m gives acceleration.
 
Numbers in set-D matching the equation, with u = 12 unit,  f/m = 2 unit
 
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(5) kinetic energy of block moving downwards in a inclined plane and moving under the influence of gravity.
 
If the block is released from top of inclined plane, its speed v at time t is given by, 
 
v = g sinθ×t
 
hence kinetic energy (1/2)mv2 = (1/2)m×( g2 sin2θ)×t2   or kinetic energy = K×t2  ........................(3)
where K  is constant. 
 
Numbers in set-C are matching to the second degree equation (3) , with K =1
Answered by Thiyagarajan K | 25 May, 2019, 11:13: PM
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