في أحد الأولد اقزام وجدت هذا السؤال
كيف أطلع a عند الثانية 5 ؟
وشكرا
A 20 kg ball is travelling in a frictionless track along positive x-direction and its velocity/time graph is shown in Figure 2. The force experienced by the ball at 5th second is:
(Force is taken positive if it acts along positive x-axis)
A) 20 N
B) − 40 N
C) Zero
D) 5 N
E) − 10N
الجواب A طبعا بس ابي افهم كيف