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A comet is heading for Jupiter with acceleration a = 50 kms^-2. The velocity of the comet at time ”t” is given by f(t) = at^2 – at + 1.

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A comet is heading for Jupiter with acceleration a = 50 kms-2. The velocity of the comet at time ”t” is given by f(t) = at2 – at + 1. Then the velocity at time t = 5 seconds is …

(1) 900 kms-1

(2) 1001 kms-1

(3) 2001 kms-1

(4) 50 kms-1

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(2) 1001 kms-1

f(t) = at2 – at + 1

m = 50(5)2 – 50(5) + 1

= 1250 – 250 + 1

= 1001 kms-1

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