مسائل في حفظ الطاقة و potential energy
 

السلام عليكم ورحمه الله وبركاته
ممكن مساعدتي في حل هذي المسائل

The two masses in the figure are released from rest with the 12 kg mass 2 m above the floor. use the energy conservation principle to find the speed with which the 12 kg mass hits the ground
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A 0.2 kg object is released from rest at point A on a track that is one-quarter of a circle with radius 1.6 m, as shown in the figure. It slides down and reaches point B with a speed of 4.8 m/s. Then it slides on a level surface a distance of 3 m until it comes to rest at point C.
a) How much work is done by friction on the package at it slides down the circular track from A to B
b) What is the coefficient of kinetic friction on the horizontal surface
c) What average power is produced by friction as the object moved from B to C
d) What instantaneous power is produced by friction at point B

سيكون لي عودة بإذن الله للحل

لكن أرجو ذكر مصدر هذه الأسئلة للفائدة

ان شاء الله وانا في الانتظار

ما هو مرجع الاسئلة ( الكتاب الذي أخذتي منه الأسئلة ) ؟

انا استخدم هذا الكتاب
“Physics for Scientists and Engineers”, by John W. Jewett and Jr. Raymond A. Serway, 8th edition (2010).
واسفه على التاخير

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شكرا جزيلا لك اخي العزيز
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آمين

حياك الله