15 POINTS ASAP:: John coasts on his skateboard at a speed of 5 m/s. He uses his foot to slow
himself down to 3 m/s. If he has a mass of 99 kg, what impulse does he
apply?
A. 198 kg. m/s
B. 495 kg•m/s
C. 505 kg•m/s
D. 297 kg. m/s

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u.s. legal proceeding.)

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?