Question

A particle starts from rest at the point A(1, 2, -3)m
and reaches at the point B(3, 4, 5)m. The magnitude of
displacement of man is
(a) 7.1 m
(b) 3.7 m
(c) 3.4 m
(d) 8.5 m​

Answer 1

Answer:

8.5 (d)

Explanation:

Since, its intial point is(1,2,-3) and final point(3,4,5)

so,we know displacement= final-initial

so here (3,4,5)-(1,2,-3)

so you get, (2,2,8)             [since subtracting, 3-1, 4-2, 5-(-3)]

if you read vector you know (2,2,8) is written in vector form as

2i+2j+8k               (where i,j and k are unit vector along x,y and z axis)

you also know, to find magnitude of a vector

to find mag. of the given vector,

√2²+2²+8²= √4+4+64=√72=8.485281374

or simply as, 8.5m

Answer 2

Answer is 8.5

Please mark me as brainliest