An electron of mass 9.11×10−31 kg leaves one end of a tv picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is a distance 2.20 cm away. it reaches the grid with a speed of 2.70×106 m/s . the accelerating force is constant.

Explanation:

We have given that mass of electron

It is given that initial velocity u=0 m/sec

Final velocity v =

Distance S = 2.2 cm = 0.022 m

According to third law of motion

Accelerating force F is given by F = ma

So accelerating force

the answer is b

explanation:

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.