iPad 19, 757 p.m. webassign net Sign In PH101 Homework Assignment 2 Serway, Phys

Question

iPad 19, 757 p.m. webassign net Sign In PH101 Homework Assignment 2 Serway, Physics A car accelerates uniformly from rest to a speed of 45.0 mi/h in 13.0 s. (a) Find the distance the car travels during this time. 261.462 Your response differs from the correct answer by more than 10%. Double check your calculations. m (b) Find the constant acceleration of the car. 1.547 m/s Need Help? Read It iChat About It -1 points SerCP92 P033 My Notes In a test run, a certain car accelerates uniformly from zero to 20 m/s in 2.95 s. (a) What is the magnitude of the car's acceleration? m/s2 (b) How long does it take the car to change its speed from 10.0 m/s to 20 m/s? (c) Will doubling the time always double the change in speed? Yes O No Why? 50% Ask Your Teacher

Explanation / Answer

final speed v = 45 mi/h = 45*1609/3600 = 20.11 m/s
from
v+u/2 = s/t
20.11/2 = s/13
s = 130.73 m
b)
from
v = u + at
20.11 =0 + a(13)
a = 1.547 m/s^2
-----------------------------
acceleration a = 20/2.95 =6.78 m/s^2
from
20 = 10 + 6.78 t
t = 1.475 sec
no

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