The average speed of a person in driving to school is 30 km/h. on the return trip along with the same route ,the average speed is 25km/h. what is the average speed for the round trip to the school

When the force acting on an object points at least partially in the direction of the motion the work done is considered to be negative

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz. what wavelength is produced?

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e