Question

29) The velocity of a particle changes with time as v= t3/3 + t2/2 + 5, then particle is undergoing ​

Answer 1

Answer

Correct option is

D

50

r

(t)=15t

2

i

^

+(4−20t

2

)

j

^

r

(t)=15(2t

2

)

i

^

+(4

i

^

−20(2t))

r

(t)=30t

i

^

+(0−40

j

^

)

r

(t)=30t

i

^

−40t

j

^

∣

r

(t)∣=

(30)

2

+(−40)

2

⇒

900+1600

⇒

2500

⇒50