Particle Mass and Forces: Resultant Force and Acceleration Calculation

[ZedCar]

Have I done this correctly? Thank you.

Homework Statement

A particle of mass 2kg moves under the action of forces 3i - 12j, and i + 6j.

(i) Find the resultant force acting on the particle in the form ai + bj
(ii) Find the acceleration of the particle

Homework Equations

F = ma

The Attempt at a Solution

(i)
R = 3i + i - 12j + 6j
R = 4i - 6j

(ii)
Using F = ma
4i - 6j = 2a
2i - 3j = a

asquared = 2squared + (-3)squared
a = square root of (4 + 9)
a = square root of 13

 

[Doc Al]

Looks good. (But don't leave out units. Physical quantities require units.)

 

[ZedCar]

Thanks very much Doc!

Looks good. (But don't leave out units. Physical quantities require units.)

Yes, forgot to type the units in. Thanks