- #1
lionely
- 576
- 2
Homework Statement
A ball is thrown vertically upwards and its height after t s is s m where
s= 25.2t - 4.9t2
Find the distance moved in the 3rd second
2. At the instant from which time is measured a particle is passing through O and traveling towards A along the straight line OA. It is s m from O after t s where
s= t(t-2)2
What is the particle's greatest displacement from O, and how far does it move, during the first 2 s?
The Attempt at a Solution
1. 25.2(3)-4.9(9) = 31.5m
Is the answer not 31.5m? But my book has a different answer.
2. For the greatest displacement I believe it is (32/27)m
but for the displacement after the first 2 seconds I'm not sure, cause if I put it in the formula for s I'll get 0.
Help is greatly appreciated.