The driver of a car moving with uniform speed of 40ms-1 observes a truck approaching from the opposite direction with a speed of 20ms-1. Calculate the speed of the car relative to that of the truck
A
.5ms-1
B
2.0ms-1
C
20.0ms-1
D
60.0ms-1
Verified Correct Answer: D.
Physical Principles & Numerical Solution
Let V\(_t\) = velocity of truck, = 20m/s V\(_c\) = velocity of car = 40m/s
\(_cV_t\) = V\(_t\) - V\(_c\) = 40 -(-20) = 40 + 20 = 60m/s
Source: Myschool Past Questions Archive (Record #33763)