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Q.

The distance travelled by a particle in time t is S. The velocities when accleration is zero. Match the following.

I) S=10t-7t3          A) 10 II) S=60t-10t3      B) 20 III) S=20t-5t3       C) 30 IV) S=30t-30t3    D) 60 

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a

C, D, B, A

b

D, A, B, C

c

A, D, B, C

d

D, C, B, A

answer is D.

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Detailed Solution

(I) s=10+-7+3      v=dsdt=10-21t2       a=dvdt=-41t=0  t=0       v=10-0=10

(II) s=60t-10t3      v=dsdt=60-30t2      a=dvdt=-60t=0       t=0      v=60-0=60

(III) s=20t-st3        v=dsdt=20-15t2        a=dvdt=-30t=0        t=0        v=20-0=20

(IV) s=30t-30t3        v=dsdt=30-90t2        a=dvdt=-180t=0        t=0        v=30-0=30

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The distance travelled by a particle in time t is S. The velocities when accleration is zero. Match the following.I) S=10t-7t3          A) 10 II) S=60t-10t3      B) 20 III) S=20t-5t3       C) 30 IV) S=30t-30t3    D) 60