a1. A bus starting from rest has an acceleration of 0.1 m/s2. What will be the velocit of the bus after 20 seconds? [Ans: 2 m Two vehicles are moving in the same direction. The velocity of the first vehicle i 8 m/s and the velocity of the second vehicle is 5 m/s. Find their relative velocit What will be the relative velocity if they move in the opposite directions? [Ans: 3 m/s, 13 m g. A car is travelling in the velocity of 20 m/s. After 30 sec it covers a distance o 1200 m. Calculate the acceleration of the car and the final velocity of the car. [Ans: 1.14 m/s2, 54.2 A truck starts to move from rest. If it gains the acceleration of 3 m/s2 in 5 sec, calculate the final velocity and distance covered by the truck. [Ans: 15 m/s, 37.5 iple Choice Questions​

To understand the electric potential and electric field of a point charge in three dimensions consider a positive point charge q, located at the origin of three-dimensional space. throughout this problem, use k in place of 14? ? 0. part adue to symmetry, the electric field of a point charge at the origin must point from the origin.answer in one word.part bfind e(r), the magnitude of the electric field at distance r from the point charge q.express your answer in terms of r, k, and q. part cfind v(r), the electric potential at distance rfrom the point charge q.express your answer in terms of r, k, and q part dwhich of the following is the correct relationship between the magnitude of a radial electric field and its associated electric potential ? more than one answer may be correct for the particular case of a point charge at the origin, but you should choose the correct general relationship. a)e(r)=dv(r)drb)e(r)=v(r)rc)e(r)=? dv(r)drd)e(r)=? v(r)r

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness

What is the relationship between wavelength of light and the quantity of energy per photon?