A car travels 90 km per hour how many how many Kilometres of distance does it travel in one second ​

Its Moving at a constant Speed of 90km/hr

You can convert this speed to Meters/Second or Change it to Km/Second(Because we need our distance in Km)

So 90km/hr x 1/60 x1/60

=90km/3600sec

v=0.025km/sec

When an Object Moves at Constant Speed... Its displacement(distance) is given by

d=vt

given v=0.025km/sec

t=1sec

d=0.025km/sec x 1sec

d=0.025km.

0.025

Explanation:

speed= 90km/hr

speed in m/s= 18/5*90

                       = 25m/s

25 m= 25/1000km=0.025

two charges are fixed in place on the x-axis as shown. the charge at x = 0 is negative and has magnitude q = 2 μcoulombs (1 μcoulomb = 10-6 coulombs). the charge at x = d, (d = +12 cm), is positive and has magnitude q = 4 μcoulombs. find a point x = xo along the x-axis at which the electric field is zero.

think its the third option