Velocity and acceleration of a particle at some instant of time are v = (2i-j+2k ) m/s and a = (i + 6j-k) m/s2 . then the speed of the particle is ....................... at a rate of ............................ m/s2.
(a)increasing , 2
(b)decreasing , 2
(c)increasing , 4
(d)decreasing , 4

answer is (b) decreasing,2
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D)decreasing at the rate of 4m/s^2
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