Qualification > Math

Mechanics Question

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elemis:

--- Quote from: Deadly_king on October 15, 2010, 03:37:48 pm ---Am sure this method will make Ari happy :P

--- End quote ---

This wasnt my question smarty pants ::)

Deadly_king:

--- Quote from: Garfield on October 15, 2010, 03:41:12 pm ---hahaha :P

yup deadly king, that's one way to go abt it  :)

--- End quote ---
Hats off to you though.....you were faster since you started earlier :P

@ Ari : I know .......but I used cosine and that's what you prefer, right?

Dania:
Refer to the attachment, thanks :)

nid404:
in the first part you found v=5m/s

for the second part, acceleration, t seconds after passing through A is given by (10-3t)
at t=0, v=5m/s

v=10t-0.15t2+C

substituting t=0 and v=5

you get c=+5

Dania:
A ball is projected from a point O on the edge of a vertical cliff. The horizontal and vertically upward components of the initial velocity are 7ms-1 and 21ms-1 respectively. At the time t seconds after the projection the ball is at the point (x,y) referred to horizontal and vertically upward axes through O. Air resistance may be neglected.

(i) Express x and y in terms of t, and hence show that y= 3x- 0.1x2

The ball hits the sea at a point which is 25m below the level of O.

(ii) Find the horizontal distance between the cliff and the point where the ball hits the sea.

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