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  1. change 60km/h into ms-1 60 X 1000/3600 = 16.67 90 x 1000/3600 = 25 120 x 1000/3600 = 33.33 The quesiton ask for the average acceleration fo the sports car, therefore it is a = initial and final / time taken 33.33 - 16.67 / (5+7) = 1.39ms-2 therefore the ans is D

  2. Q1: During the acceleration period, using equation of motion: v = u + a.t where u = 0 m/s, a = 3 m/s2, v = 15 m/s, t = t1, say hence, 15 = 3 x t1 t1 = 5 s During the decceleration period, use equation of motion: v = u + at v = 0 m/s, u = 15 m/s, a = -1.5 m/s2, t = t2, say hence, 0 = 15 + (-1.5).t2 t2 = 15/1.5 s = 10...

  3. "Scalar" is a physical quantity that has only magnitude. Examples are mass, density, volume, temperature, energy, time, frequency ...... etc. "Vector" is a physical quantity that has both magnitude and direction. Examples are...

  4. S(t) = ut + 0.5at^2 where S(t) is a function of t and equal to distance (in metre) travelled after t seconds with given initial speed of u and acceleration of a for this question, u = 20ms-1 and a = -1.5ms-2 (deceleration) After 3 seconds, the distance...

  5. ...19970301_DP_R.jpg Arsenal FC 1995-1998 POSITION Midfielder DATE OF BIRTH Friday...

    分類:足球 > 其他 - 足球 2007年01月03日

  6. Assume the up direction is + initial velocity of the ball (u) = 0 m/s the acceleration due to gravity = 10m/s^2 let s be the distance travelled by the ball t be the time a be the acceleration By the formula s = ut + (1/2) at^2 distance travelled by the ball in the 1 second = 0 (1) + (1/2) (-10) (1)^2...

  7. 唔知你幾大所以不知你將來可以有幾高。不過睇啲數據你現時應該係得分後衛 (shooting guard) 或小前峰 (small forward)...like Jason Kidd 將來可能都要做Point Guard,視乎你將來啲rebound and block shot如何.照睇做指揮都ok. Hope it...

    分類:體育 > 籃球 2007年04月10日

  8. .... XXXXXX has been in our employment as a ( position ) sine (Date). He/She is entitled to an annual...

  9. 1. Take upward direction be positive. For the dolphin to reach the ball, the velocity of the dolphin is 0. So, final velocity, v = 0 Displacement, s = 4 m Acceleration due to gravity, g = -10 ms-2 By v2 = u2 + 2gs (0)2 = u2 + 2(-10)(4...

  10. 其實只要你參考返警隊既網頁, 佢有講明聘請警員/督察既要求 警員要求: 香 港 中 學 會 考 五 科 E 級 或 以 上 成 績 , 包 括 [ 中 國 語 文 科 及 英 國...

    分類:政治及管治 > 政府 2008年07月01日