1. A long distance runner is moving at a constant speed of 5 m/s. How long does it take the runner to travel 100 m? 2. Ms. Sarah's cat Pup is trying to catch a lizard
If Pup displaces 20 meters west in 10 seconds, what is Pup's velocity?

3. A bullet train is traveling North with a velocity of 90 m/s and it takes 600 s to reach its destination, how far did the train travel?

4. If a rocket ship travels upwards with a velocity of 11,000 m/s and it is 15,000 m to the edge of Earth's atmosphere, how long does it take for the rocket to exit Earth's atmosphere?​

Answer: a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same sign as the  -4.0  µc charge.======electricstatic force between two point charges  is given by    where k is coulomb's constant,  8.99×10⁹  n·m²/c², q₁ and q₂ are the point charges, and r is the distance between the two point charges.assign positive to q₁let q₁ =  6.0 µc, q₂ = -4.0  µc, q₀ represent the charge at the origin, and q₃ represent this new charge to place.the charge at the origin q₀ would experience the following force f₀₁ from q₁, with r = 6.0 m (note that 1  µc = 10⁻⁶ c)    the force from q₂    the force from q₃    the net force on the origin charge, q₀, has to be zero for no electrostatic forcehaving an equation where k and q₀ can be divided out of the equation will allow us to solve for q₃    isolating:     a charge of -1.0  × 10⁻⁴ c must be placed  at x = 26 m.the sign of the charge will be the same as the  -4.0  µc charge