Derek is riding his bike 10 mph. He takes 20 seconds to reach 15 mph. What is his acceleration? 0.25 m/s/s 1.25 m/s/s 4 m/s/s cannot be determined

Need this asap! geography 10 points! will mark brainliest! (this is a webquest < i'm bad at these) answer each question below thoroughly (3-4 sentences each): 1) has international aid done more harm than good for the people of africa? 2) what are the benefits of international aid? 3) what are the problems with international aid? 4) what are the alternatives to international aid? 5) what do you think is the best approach to offer international aid? whoever answer accordingly will get brainliest, youuu humans!