Using s scale of 1cm to represent to 10N, find the size and direction of the resultant of forces of 30N and 40N acting at right angles to each other

A) acceleration. this seems to be the one that makes sense.

Assuming you're referring to significant figures, none of these answer choices are shown to be zero as significant digits. did you, by chance, forget to add something?

Choice a is correct.kinetic energy equation:     ke = (1/2)(m)(v²)this tells us that ke is directly proportional to mass and the square of velocity. in other words, the more mass and more velocity an object has, the more kinetic energy.if an object is sitting at the top of a ramp, there is no velocity and therefore no kinetic energy.     choices b and d are wrong.a golf ball has more mass than a ping-pong ball, so a ping-pong ball would have less kinetic energy than a golf ball rolling off the end of a ramp.     choice c is wrong.choice a is correct.