Answer:
245N
Explanation:
We just need to multiply the force the man pulls the wagon by the cosine of the angle with the ground.
F = 330N * cos(42°) = 245.2N
Lực hút trái đất gọi Là trọng lực
Constant speed i guess but just ask a tutor
probrably at the schools website but i dont know what school you go to so i would need more info
Let 10 nC and 20 nC charge is placed at "d" distance
now let say we will have a point at distance "x" from 10 nC at which electric field will be zero
now we will have


now plug in all data


square root both sides




so yes there will exist a point between 10 nC and 20 nC charge at which electric field will be zero