Does anyone know what formula we need to use for this question?

Hi!

They have given us the value for angular velocity and radius. so, speed can be calculated by using the relation.

v(speed)=angular velocity x r(radius)=10 x 2.5=25 ms^-1

for acceleration we can use the relation

ac=v^2/r=25 x 25/2.5=250ms^-2.

thus, row 1 is correct which is option D

Hope it helps:)

how come velocity = speed?

cuz u wrote v(speed)

Hi!

This formula relates linear speed with angular velocity.

here i represented linear speed with(v) while anglular velocity is represented by omega but i just wrote it simply.