Efficiently Calculate Stopping Time for a Cyclist | Displacement Homework

  • Thread starter Thread starter chuckset
  • Start date Start date
  • Tags Tags
    Displacement
AI Thread Summary
The discussion focuses on calculating the stopping time for a cyclist who slows from 11.0 m/s to 3.0 m/s after applying brakes. The deceleration was determined to be -3.2 m/s², and the time to reduce speed to 0 m/s was calculated to be approximately 0.9375 seconds. The method used to find the stopping time is confirmed as correct, emphasizing the importance of applying the appropriate kinematic equations. The conversation highlights the need to ensure all variables are accurately accounted for in the calculations. Overall, the approach to solving the problem is validated by peers in the discussion.
chuckset
Messages
12
Reaction score
0

Homework Statement


A cyclist is traveling with a speed of 11.0 m/s when she applies the brakes. After slowing for 2.5s, her speed has been reduced to 3.0 m/s. If she continues braking, how much longer will it take her to stop?

I found the deceleration to be -3.2 m/s^2
V1 = 3.0 m/s
V2 = 0

2. The attempt at a solution

I used the equation V2 = V1 + (a)(t) and got the change in time to be 0.9375s

Does this seem like the correct way to solve this?
 
Physics news on Phys.org
Well you found her deceleration correctly, so now what you want to get is the time it takes the cyclist to go from 11 m/s to 0 m/s.
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

A cyclist riding on a closed path....
Replies
2
Views
1K
Help with question on motion: Avoiding a rear-end collision
Replies
6
Views
3K
Will The Cars Stop In Time? - Check My Work Please :)
Replies
13
Views
1K
What is the least time to get from point ##A## to point ##B##
Replies
2
Views
1K
Motion in a straight line and a cyclist
Replies
3
Views
2K
Finding Displacement based on Velocity Graph
Replies
11
Views
2K
Kinematic Equations Homework Solutions
Replies
8
Views
2K
Frequency of Trucks Overtaking a Cyclist
Replies
16
Views
2K
Kinematic problem, are my variables right,
Replies
34
Views
3K
Average Speed Question for a Train that Accelerates and then Decelerates
Replies
20
Views
2K

Hot Threads

Recent Insights

Back
Top