Question

A body is moved from A(1,2,3) to B(3,3,3) under force (^i+^k)N.Find work done.

Answer 1

work done is:Force× distance

total distance moved by use of magnitude of vectors;

√(3-1)²+(3-2)²+(3-3)²=

√2²+1²=

√5=2.236 units

work done=√5(∧i+∧k)

∴=√5i+√5k