You find it takes 200 n of horizontal force tomove an unloaded pickup truck along a level road at a speed of2.4 m/s. you then load up the pickup and pump up itstires so that its total weight increases by 42% whilethe coefficient of rolling friction decreases by19%.a) now what horizontal force will you need to move the pickupalong the same road at the same speed? the speed is low enough thatyou can ignore air resistance.

The horizontal force that will be needed to move the pickup along the same road at the same speed is 230 N

Explanation:

given information:

horizontal force, F = 200 N

speed, v = 2.4 m/s

total weight increase 42%

coefficient of friction decrease by 19%

now, lets take a look of horizontal system

F - F(friction) = 0

F = F(friction)

F = μ N

F = μ m g

μ m g = 200 N

now find the force to move the pickup along the same road at the same speed(F(move))

total weight increase 42%, m g = 1+0.42 = 1.42

he coefficient of rolling friction decreases by 19%, μ = 1 - 0.19 = 0.81

F (move) = (0.81μ) (1.42 m g)

               = (0.81) (1.42) (μ m g)

                = (0.81) (1.42) (200)

                = 230 N

b) 10 minutes

girls stopped for 10 minutes.