AS question I'm stuck on heeellp!

  • Thread starter meawinner
  • Start date
  • #1
11
0
Hi this is an AS physics question that i am stuck on. I tried it but I dont get the answer it says in the answers.

A girl diving froma 15m plstform wishes to know how fast she enters the water. She is in the air for 1.75s and dives from rest(with an initial speed of zero). What can you tell her about her entry speed?

I tried to do speed=distance over time
Then I used acceleration is final velocity-initial velocity over time. But neither worked so can some1 please help me. Thanks
 

Answers and Replies

  • #2
769
38
Hello meawinner,

Since Vf = Vi + a t, and the acceleration is just that of gravity, it is a simple calculation.

Vf=Vfinal, Vi=Vinitial, a=acceleration, t=time.

Alternately, you could us the formula Vf = Vi + sqrt(2 a d)
 

Related Threads on AS question I'm stuck on heeellp!

  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
10
Views
1K
  • Last Post
Replies
4
Views
1K
Replies
5
Views
2K
  • Last Post
Replies
10
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
11
Views
1K
  • Last Post
Replies
1
Views
1K
Top