anonymous
  • anonymous
A ball is thrown downwards with speed 5m/s from a top a 20m high building. a. How long does it take for the ball to hit the ground? b. How fast is it moving when it hits the ground?
Physics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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JT950
  • JT950
(a) S=u t+(1/2) gt^2 20=5 t+(1/2) (9.8) t^2 t=1.57 second (b) V=u+gt =5+(9.8)(1.57) =20.42m/s
anonymous
  • anonymous
thnks
anonymous
  • anonymous
what are the variables S , u

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JT950
  • JT950
S is distance travelled u is initial velocity v is final velocity
JT950
  • JT950
there is 1 more equation for this v^2=u^2+ 2as
anonymous
  • anonymous
so which one should i use
JT950
  • JT950
All you can use depend on the situation. In this situation , S,u,g is given, you decide what to use :)
anonymous
  • anonymous
ok thnkds a lot
anonymous
  • anonymous
im still confused as to calculating the first part the units are messing me up and also you have t and t^2
JT950
  • JT950
use SI unit m, m/s , s , m/s^2 t^2 and t use quadratic equation to solve you get 1 negative(rejected) 1 positive(1.57)

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