Question

A vw bug is driving north on a straight two lane road at a constant 54 mph and chevy impala south at 47 on the same road (but different lane). What is the velocity of the chevy impala relative to the vw bug?

A.101 mph, north
B.7mph, south
C. 101mph, south
D.7mph, north

Answer 1

Velocity of vw bug is given as

`v_1 = 54 mpH` towards north

velocity of imphala is given as

`v_2 = 47 mph` towards south

now we need to find velocity of imphala relative to bug

`v_(21) = v_2 - v_1`

`v_(21) = 47 - (-54) = 101 mpH`

so the speed is 101 mpH towards south so correct option is C