What Is the Total Impulse on a Sliding Block?

[enchantress95]

Momentum impulse physics question, HELP ASAP please!

Homework Statement

A 4.0-kg block slides along a frictionless surface with a constant speed of 5.0 m/s as shown. Two seconds after it
begins sliding, a horizontal, time-dependent force is applied to the mass. The force is removed eight seconds later. The
graph shows how the force on the block varies with time.
• What is the magnitude of the total impulse of the force acting on the block?
• What, approximately, is the speed of the block at t = 10 seconds?

Homework Equations

p= mv
K.E= 1/2*m*v^2

The Attempt at a Solution

p= mv = 20kg*m/s
K.E= 1/2*m*v^2 = 50 J

I was solving this past paper and the answer is 42N but idk how to get tht :s any help wud be appreciated, thanks!

 

[Simon Bridge]

Welcome to PF;
Please show us your working and how you have been thinking about the problem so far.
That is the best and fastest way to get the help you need.

You are missing an equation - $p=\int F(t)\; dt$
... which is to say: the change in momentum is the area under the force-time graph.
... what is "specific impulse"?