2. A canon ball of 5 kg is fired upward with initial speed of 56.25 m/s, it reach its highest point after 4.5s. (i) Find the acceleration of the canon ball. (ii) Find the net force acting the canon ball. (iii) Compare the net force with gravitational force, and justify your result. (iv) Draw the free body diagram.

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2. A canon ball of 5 kg is fired upward with initial speed of 56.25 m/s, it reach
its highest point after 4.5s.
(i) Find the acceleration of the canon ball.
(ii) Find the net force acting the canon ball.
(iii) Compare the net force with gravitational force, and justify your result.
(iv) Draw the free body diagram.
3. The cable hanging a 1800 kg elevator has a maximum strength of 20000 N.
(i) Draw the free body diagram.
(ii) Find the maximum acceleration of the lift before breaking of the cable.
Transcribed Image Text:2. A canon ball of 5 kg is fired upward with initial speed of 56.25 m/s, it reach its highest point after 4.5s. (i) Find the acceleration of the canon ball. (ii) Find the net force acting the canon ball. (iii) Compare the net force with gravitational force, and justify your result. (iv) Draw the free body diagram. 3. The cable hanging a 1800 kg elevator has a maximum strength of 20000 N. (i) Draw the free body diagram. (ii) Find the maximum acceleration of the lift before breaking of the cable.
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