John coasts on his skateboard at a speed of 1 m/s. He uses his foot to increase his speed to 3 m/s. If he has a mass of 95 kg, what impulse does he
apply?
A. 285 kg•m/s
B. 95 kg•m/s
c. 190 kg•m/s
D. 145 kg•m/s

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?