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1. ### You throw a ball straight into the air at 18m/ s from 32m above the ground. How long does it take for the ball to hit the ground?

At impact, the velocity is -18 m/ s , so v = u + at gives -18 m/ s = 18m/ s - 9.8m/s² * t t = 3.7 seconds

1 Answers · Science & Mathematics · 24/09/2020

2. ### a) calculate the force of friction between the box and incline?

...the bottom K = 1/2 mv^2 is just K = U -W --> 1/2 mv^2 = mgL*sin(q) - f*L v = sqrt(2*(gL*sin(q) - f*L/m)) = 2.26 m/ s THe other way is to use forces: ma...

3 Answers · Science & Mathematics · 21/05/2020

...cm = 0.0005 m initial transverse velocity u = 0 s = u *t + ½at² 0.0005 m = 0*t + ½*8.34e13m/s²*t² t = 3.46e-9 s to cross between the plates so v = d / t = 0.026m / 3.46e-9s = 7.5e6 m/ s If...

1 Answers · Science & Mathematics · 08/03/2020

4. ### Uniform Acceleration Problem?

5) velocity at mid point = sq.root {( 3x3+9x9/2}=6.708m/sec. 6) S = it + 1/2 at’2. Ie., 36= ux4+1/2 2x16 Ie., u = 5m/sec and so, velocity at mid point of intersection is V ’2 = 25+2x2x18 = 97 So that V = 9.848 m/sec. 7) height of balloon when stone...

1 Answers · Science & Mathematics · 11/10/2020

5. ### If Global Warming is real, why is this happening?

..., since "Hockey Stick Mann' s " court defeat. You see the same desperation by guys like.... https://www.youtube.com/watch?time_continue=446& v =1L530b4nnQ8

18 Answers · Environment · 18/09/2019

6. ### Whats the name of this?

2 Answers · Entertainment & Music · 10/05/2019

7. ### Physics question: Speed and deceleration.?

...distance travelled = length of the train, s = 6.00 x 10² m = 600 m s = ½( u + v )t t = 2s/( u + v ) t = 2*600/(23.61+3.89) t = 43.64 s

1 Answers · Science & Mathematics · 27/09/2018

8. ### Physics projectile motion question?

...the ball hit the ground? v = u + at v = 2.8 + (-9.8)(1.189) v = -8.854 speed... magnitude of velocity v = 8.9 m/ s to the two significant digits...question numerals b. How long after the first ball is...

1 Answers · Science & Mathematics · 01/03/2018

9. ### A puck of mass 30g slides across rough ice, experiencing a frictional force of 0.2N. If it was moving at 10km/h when it hit the ice patch..?

... the motion a = - 0.2 / 0.03 = -6.67 m/ s ^2 v = u + at 0 = (10 / 3.6) - 6.67(t) t = 0.417 s s = s0 + ut + (a/2)t^2 s = (10/3.6)(0.417...m Patch was at least 57.8 cm long for puck to stop (could have been longer ...

3 Answers · Science & Mathematics · 11/01/2018