`vec(r)=15t^(2)i+(20-20t^(2))j` find magnitude of acceleration at `t=1` sec.A. `30m//s^(2)`B. `40m//s^(2)`C. `70m//s^(2)`D. `50m//s^(2)`

`vec(r)=15t^(2)i+(20-20t^(2))j` find magnitude of acceleration at `t=1

1.	`vec(r)=15t^(2)i+(20-20t^(2))j` find magnitude of acceleration at `t=1` sec.A. `30m//s^(2)`B. `40m//s^(2)`C. `70m//s^(2)`D. `50m//s^(2)`
Answer» Correct Answer - D

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`vec(r)=15t^(2)i+(20-20t^(2))j` find magnitude of acceleration at `t=1` sec.A. `30m//s^(2)`B. `40m//s^(2)`C. `70m//s^(2)`D. `50m//s^(2)`

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