Answer:
(3) Driving in a straight line at 100 kilometers per hour
Explanation:
let us see each at a time.
(1) Slaming on the brakes causes the speed to become 0units/sec and car comses to rest. the car experiences deceleration (negative acceleration), we can role this one out.
(2) Going from 0 to 100Kilometers per hour, speed increases from 0 to 100km/s in 10 seconds that is acceleration. we can rule this one out.
(3) Driving in a straight line with 100km/hour velocity, here we have constant velocity and there is no acceleration so in this case we are not accelerating.