a van is traveling on a road at a speed of 55 km/h. a girl sitting near the driver of the van throws a paper…
a van is traveling on a road at a speed of 55 km/h. a girl sitting near the driver of the van throws a paper airplane to a boy at the back of the van with a speed of 2 km/h. the speed of the paper airplane, to the nearest whole number relative to a stationary observer on the side of the road, is km/h.
Answer
Answer:
53
Explanation:
Step1: Determine relative - velocity direction
The van moves forward at 55 km/h and the paper - airplane is thrown backward relative to the van at 2 km/h.
Step2: Calculate relative velocity
We subtract the velocity of the paper - airplane relative to the van from the velocity of the van. Let the velocity of the van be (v_{van}=55) km/h and the velocity of the paper - airplane relative to the van be (v_{pa - van}=- 2) km/h (negative because it's in the opposite direction of the van's motion). The velocity of the paper - airplane relative to the stationary observer (v_{pa}) is given by (v_{pa}=v_{van}+v_{pa - van}). So (v_{pa}=55+( - 2)=53) km/h.