A skateboarder starting from rest accelerates down a ramp at 2m/s^2 for 2 seconds. What is the final velocity of the skateboarder? PLEASE SHOW WORK!!

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25? , b) el tiempo que el balón permanece en el aire.

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?