A2 kg ball b is travelling horizontally at 10 m/s when it strikes 2 kg ball a. ball a is initially at rest and is attached to a spring with constant 100 n/m and an unstretched length of 1.2 m. knowing the coefficient of restitution between a and b is 0.8 and friction between all surfaces is negligable, determine the normal force between a and the ground when it is at the bottom of the hill.

coil wire, increase current, put iron inside the coil

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.