A car of mass 200kg moving at a velocity of 120km/h its velocity to 60km/h in 40 second when the car hits an object 1. Calculate the momentum before hitting the object.
2. Calculate its momentum after hitting the object.
3. Calculate the change in momentum.
4. Calculate the resultant force once the car hit the object

Plss anybody know how to do this? ? i need the answers from a through d

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples