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Q.

The position vectors of two balls are given byr1→ = 2(m)i^+7(m)j^r2→ = −2(m)i^+4(m)j^What is the distance between the two balls?

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a

4 m

b

4.5 m

c

5 m

d

3 m

answer is C.

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Detailed Solution

r1→ = 2(m)i^+7(m)j^r2→ = −2mi^+4mj^∴ r1→−r2→ = [2−(−2)]i^+(7−4)j^∴|r1→ −r2→| = 42+(3)2 = 52 = 5 m

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