How much force does it take to bring a 1,050 N car from rest to a velocity of 42 m/s in 13 seconds?

F = 339.23 N

Explanation:

Weight of a car, W = 1050 N

Initial velocity, u = 0

Final velocity, v = 42 m/s

Time, t = 13 s

The weight of an object is given by :

W = mg

g is the acceleration due to gravity

The force acting on car is :

So, the force acting on the car is 339.23 N.

because growing process had stoped after 4-5 year

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.