The position vector of a particle is given by r ⃗=3t i ̂-2t^2 j ̂+4k ̂ where t is in second

Описание к видео The position vector of a particle is given by r ⃗=3t i ̂-2t^2 j ̂+4k ̂ where t is in second

The position vector of a particle is given by r ⃗=3t i ̂-2t^2 j ̂+4k ̂ where t is in second and r ⃗ is in metres. The magnitude of the velocity at t=2 s will be
A) 8.54 m/s
B) 9.5 m/s
C) 8 m/s
D) 9.5 m/s

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