A car travels 50 km from A to B at an average speed of 100 kmh ¹. It stops at B for 45 minutes and then returns to A. The average speed for the whole journey is 40 kmh ¹. Find the average speed from B to A.

A car travels 50 km from A to B at an average speed of 100 kmh ¹. It stops at B for 45 minutes and then returns to A. The average speed for the whole journey is 40 kmh ¹. Find the average speed from B to A.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Similar questions

During a test, a rocket travels upward at Va = 60 m/s and when it is Sa = 20 m from the ground its engine fails. Determine the maximum height Sb reached by the rocket and its speed just before it hits the ground. use 2 decimal places.
An unidentified flying object (UFO) is observed to travel a total distance of 49000 m, starting and ending at rest, over a duration of 3.07 s. Assuming the UFO accelerated at a constant rate to the midpoint of its journey and then decelerated at a constant rate the rest of the way, what was the magnitude of its acceleration? Express your answer in g s , where 1 g = 9.81 m/s^2. 20,796 g s 10,398 g s 2,120 g s 1,060 g s
An object is thrown straight upward with an initial velocity of 11.7 m/s. What is the object's maximum upward displacement? Enter a number assuming proper SI Units.
The acceleration of the linear trajectoryof problem P1-13 is shown in Fig. P1.14.Determine the equation of a(t) for(a) 0 ≤ t ≤ 1 s(b) 1 ≤ t ≤ 3 s(c) 3 ≤ t ≤ 4 s
Given that a particles motion is described by the position function x(t) = (1.64)t2 + (-0.05)t5 + (-1.52)t9 m, find its acceleration at time t = 0.05 s. Round your answer to 2 decimal places.
A person takes a trip, driving with a constant speed of 95.5 km/h, except for a 22.0-min rest stop. If the person's average speed is 70.8 km/h, find the following. (a) How much time is spent on the trip? (b) How far does the person travel? km
External stimuli are communicated to the brain by means of electrical signals propagating along nerve cells at a speed of approximately 25 m/s. Similarly, electrical messages are sent at the same speed from the brain along nerve cells to the muscles. Reflex actions are controlled by a relatively simple nerve circuit from a muscle to the spine and back to the muscle. Estimate the reflex time for a stimulus at the knee. (Assume that the signal resulting from the stimulus must travel a distance Δs = 1 m.)
You leave Calgary at 09:00 hrs in the morning for Banff. The distance Calgary-Banff = 160 Km. The max speed on the highway is 110 Km/hr. At what time should you arrive in Banff?
Starting from rest at home plate, a baseball player runs to first base (90 ft away). He uniformly accelerates over the first 12.5 ft to his maximum speed, which is then maintained until he crosses first base. If the overall run is completed in 3.7 seconds, determine his maximum speed, the acceleration over the first 12.5 feet, and the time duration of the acceleration. t = 0 Ä & Answers: Vmax a= 12.5 t = i i i 77.5' t = 3.7 sec ft/sec ft/sec² sec
A car travels 2.00 km at an average speed of 72.0 km and then 2.00 km at an average speed of 39.0 km/h. What is the car‘s average speed during the entire 4.00 km interval?
Compute your average velocity in the following two cases: (a) You walk 64.0 m at a speed of 1.28 m/s and then run 64.0 m at a speed of 3.98 m/s along a straight track. (b) You walk for 1.00 min at a speed of 1.28 m/s and then run for 1.39 min at 3.98 m/s along a straight track.
An object's position in the X-direction as a function of time is given by the expressio%3B x(t) = 5t2 + 2t where are quantities have proper SI Units. What is the object's average velocity in the x-direction between the times t = 1.71 s and t = 2.37 s. Just enter the number rounded to 3 significant figures and assume it has proper SI Units.