Question

(1) its magnitude changes
(2) Its direction changes
(3) it is zero
(4) It is uniform
The velocity of a body initially moving with 20 m/s
along a straight line with constant retardation 2 m/s
reduces by 75% in time T. What is the time taken
in doing so?
(1) 15s
(2) 7.5 s
(3) 4.85
(4) 125
A rain drop of mass 0.2 g is falling with uniform​

Answer 1

Answer:

v=v1-v2=18

r=75٪

t=r/v

t=75/18=4.18