1) A box moved down a factory conveyor belt at a constant velocity for 0.5 minutes. It moved 20 meters in that time. What was the box's velocity? b) Write your answer as a whole number.

61 point A freight train moving at a speed of \( 110.5 \mathrm{~km} / \mathrm{hr} \) decelerates at a constant rate in order to stop. What deceleration rate (in \( \mathrm{m} / \mathrm{s}^{2} \) ) must it have in order for it to stop in a distance of 1114 m ? (Deceleration will be a positive number).

7.1 point A cat is sitting on a table admiring a small glass bottle located close to the table edge. Next thing, the bottle is flying off the table horizontally with a speed of \( 1.08 \mathrm{~m} / \mathrm{s} \). At what speed will the bottle hit the floor 0.69 m below the table surface? Ignore effects of air friction.

A mass on a spring bobs up and down, completing 2 full cycles every second. What are the period and frequency of the mass?

Ex 26 (Pec9) จากรูป นำเชือกผูกกับก้อนน้ำหนัก \( W \) จงหาอัตราส่วนของขนาดของแรงดึงในเส้นเชือก \( T_{1} \) ต่อ \( T_{2} \) กำหนด \( \sin 53^{\circ}=4 / 5, \sin 37^{\circ}=3 / 5 \)

81 point Heavy but sensitive equipment (like hifi equipment), often have spring-loaded legs to dampen external vibrations. Consider an amplifier of mass 29.5 kg resting on a flat table. The amplifier has 4 feet, each consisting of identical springs of spring constant \( 16.4 \times 10^{3} \mathrm{~N} / \mathrm{m} \). By how much (in mm) are each of the springs in the feet compressed?