A uniform metre rule pivoted at 10cm mark balance when a mass of 400g is suspended at 0cm mark. Calculate the mass of the metre rule.​

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?