The position vector of a moving body at any instant of time is given as r = ( 5 t 2 i ^ − 5 t j ^ ) m . The magnitude and direction of velocity at t = 2 s is,

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The position vector of a moving body at any instant of time is given as r = ( 5 t 2 i ^ − 5 t j ^ ​ ) m . The magnitude and direction of velocity at t = 2 s is,

TestHub · Accepted Answer

​ r = 5 t 2 i ^ − 5 t j ​ v = 10 i ^ − 5 j ^ ​ v = 20 i ^ − 5 j ^ ​ at t = 2 sec ​ ​ tan θ = 5 20 ​ = 4 θ = tan − 1 4 From -veY-axis ​

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