The phrase "accelerated abruptly" is correct and usable in written English.
It can be used to describe a sudden increase in speed or intensity in various contexts, such as in scientific writing, storytelling, or technical descriptions.
Example: "The vehicle accelerated abruptly, causing the passengers to lurch forward in their seats."
Alternatives: "suddenly sped up" or "increased rapidly".
As the cab began to move, it accelerated abruptly, slamming into Mr. Olivo, who had ridden around the cab, and jumping the curb.
Shoreline regression accelerated abruptly in the Iron Age, and especially in the last 2 kyr, due to the increased woodland removal on the Apennines.
De Villota had just completed a straight-line aerodynamic test and was returning to mechanics when her car accelerated abruptly and slammed into a team truck at helmet level.
History can follow a capricious path, sometimes meandering slowly for decades only to accelerate abruptly and take a vertiginous turn.
On one occasion, I accelerated too abruptly from a traffic light and my right hand's fingers slipped off the brake lever and my left hand accidentally hit the manual downshift button, causing the bike to lurch (and nearly lose me).
And though it's been an ongoing topic and issue for several years, growing distrust in the media has accelerated so abruptly that the situation now borders on alarming.
But it abruptly accelerated the date to November 4-5.
Both domestically and internationally, many properties managed by major hotel companies are reeling from an unanticipated drop in demand that began in late summer and abruptly accelerated with the economic crisis on Wall Street.
Changes like this do not always happen steadily; since 1969, there have been four well-documented "geomagnetic jerks," in which the rate of change in the field strength abruptly accelerated before, months later, settling back to normal.
Whether the treadmill accelerated gradually or abruptly, the mice without muscular CrAT faltered first.
Experimental results show that in hydrogen gas containing up to 1000 v.p.p.m. oxygen fatigue crack growth rates for X52 line pipe steel are initially coincident with those measured in air or inert gas, but these rates abruptly accelerate above a critical ΔK level that depends on the oxygen concentration.
