• Support PF! Buy your school textbooks, materials and every day products Here!

Dynamics question

  • #1

Homework Statement


he position of a ball as its kicked upwards is measured as
y(t) =(-4.9 t^2 + 20t + 0.50)m,
where t is measured in seconds. Find the vertical component of velocity and acceleration of the ball as a function of time. If the ground is located at yg = 0, find the time at which the ball hits the ground.



Homework Equations



Cant I take the first and second derivative to find velocity and acc.? then i don't know how to solve for time

The Attempt at a Solution


would velocity= -9.8t + 20
acc.=-9.8??
 

Answers and Replies

  • #2
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
35
Cant I take the first and second derivative to find velocity and acc.?
Yes

The Attempt at a Solution


would velocity= -9.8t + 20
acc.=-9.8??
Yes and yes.

then i don't know how to solve for time
Using the expression for y(t), find the t at which y = yg.
 

Related Threads for: Dynamics question

  • Last Post
Replies
1
Views
668
  • Last Post
Replies
11
Views
667
  • Last Post
Replies
4
Views
4K
  • Last Post
Replies
2
Views
1K
  • Last Post
Replies
2
Views
553
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
3
Views
2K
Top