A passenger car start from rest and it accelerates uniformly and attain a velocity of 20m/s after 5 seconds. It maintain this velocity for 6 seconds and then came to rest 4 seconds later 1: find the initial acceleration and the total distance covered

Ineed the answers for these promblems i have

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.

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