How much work must be done on a 5 kg snowboard to increase its speed from 2 m/s to 4 m/s
a) 30j
b) 15j
c) 40j
d) 22.5j

30 Joule of work is to be done.

Option: a

Explanation:

Given, mass of snowboard = 5 Kg

Initial speed = 2 m/s,  Final speed = 4 m/s, Work done = ΔE

Where, ΔE= change in kinetic energy  

Solution:

=

Work done = ΔE = Kinetic Energy (final) - Kinetic Energy (initial)  

Work done = ΔE = 40 J - 10 J work done = ΔE = 30J

6 cos 34, 6 sin 34 trig

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.