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A force (10i + 4j)N acts on a body of mass 2kg which is a...

A force (10i + 4j)N acts on a body of mass 2kg which is at rest. Find the velocity after 3 seconds.

A.

(5i3+2j3)ms1

B.

(10i3+4j3)ms1

C.

(5i+2j)ms1

D.

(15i+6j)ms1

Correct answer is D

Recall, F=mass×accelerationacceleration=forcemass

= 10i+4j2=(5i+2j)ms2

= v=u+atvat 3 seconds=0+(5i+2j×3)

= (15i+6j)ms1