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# Kinematic of the particles moving in a straight line watch

1. A ball is projected vertically upwards, from a point X which is 7m above the ground, with speed 21m/s². Find the time of the flight of the ball.
2. You can use the suvat equations for this

Taking upwards as positive:

s = -7
u = 21
a = -9.8

You can do the rest
3. (Original post by bendent1234)
...
Full solutions are against the rules of this forum. Please continue to help students with hints and guide them towards answers
4. (Original post by notnek)
Full solutions are against the rules of this forum. Please continue to help students with hints and guide them towards answers
Sorry, I have edited it now

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Updated: February 1, 2017
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