Top Posters
Since Sunday
38
o
10
j
9
m
9
C
8
s
8
a
8
f
8
y
8
n
8
d
8
M
7
Home Q & A Board Science-Related Homework Help Physics
New Topic  
Rjune1 Rjune1
wrote...
Go to Answer
Posts: 52
Rep: 0 0
11 years ago
A stone is thrown vertically upwards with an initial speed of vo. At times t and t+2.00s, it has a speed of 0.400 vo. Calculate t. (A:1.50s).

I keep trying to solve for t using the equation v = vo + at, but I get the incorrect answer. What am I doing incorrect?
Read 349 times
1 Reply
Replies
Answer accepted by topic starter
LeoLeo
wrote...
#1
Posts: 22
Rep: 0 0
11 years ago
Sign in or Sign up in seconds to unlock everything for free
when a stone is having a same speed but different time, it means that it is at the same height (let's say h)
the stone needed 2 second from h Rightwards Arrow maximum height Rightwards Arrow h
so the time needed to reach maximum height is 1 second (calculated from distance h.

velocity at maximum height is 0, hence

vf = vi - gt
0 = 0.4xV0 - 10x1
v0 = 25 m/s

now calculate the time t
vf = vi -gt
0.4 V0 = V0 -g.t
10t = 0.6.v0
10t = 0.6 x 25
t = 1.5 s

hope that help ;p
1

Related Topics
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  306 People Browsing
 192 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 218
  
 370
  
 220
Your Opinion
Which is the best fuel for late night cramming?
Votes: 84
Previous poll results: Should Ph.D.'s be addressed as doctors?