Question

7. The position vector of a moving particle at timetis
r=3i + 41j - tk. Its displacement during the time
interval t =1s tot = 3 sis
(a) j-
(b) 3i + 4j -
(c) 9i+36 -27
(d) None of the above​

Answer 1

Answer:

None of the given option

Explanation:

The position vector of a moving particle at time t is

r=3i + 41j - tk. Its displacement during the time

interval t =1s tot = 3 s

at t = 1 sec

r = 3i + 4j - k

at t = 3 sec

r = 3i + 4j - 3k

Displacemnet from t = 1 sec tp 3 sec

= (3i + 4j - 3k) - (3i + 4j - k)

= - 2k

so None of the given option