- #1
thomas49th
- 655
- 0
Homework Statement
A bell is thrown vertically upwards with speed 10m/s from a point 2 m above horizontal ground.
a) calculate the length of time for which the ball is 3m or more above the ground
Homework Equations
kinematic ones
The Attempt at a Solution
We I wanted to find the intial speed of the ball when it is 3 metres above the ground
i used v² = u² + 2as
and found u to be about 10.936
now do i need to find how high the ball goes from 3m above the ground to having a velocity of zero? I got 314/93. Once i find this i can I then use this in the s= ut + 0.5at² equation.
4.9t² + 10t - (314/53) = 0
I tried and i got a final answer of -1.86 when the answer in the book is 1.83
Have I done the right steps?
Thanks
Tom
Last edited: