1. Malik is throwing rocks into a lake. He throws a 1 kg rock that travels 5 m/s immediately after it left his hand. He also throws a 0.5 kg rock that travels 8 m/s immediately after it left his hand. Which rock did Malik throw the hardest? Explain your answer. How do you know which rock Malik threw the hardest?

please help me lol
​

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?