 #1
correction_tape
 2
 0
 Homework Statement:

The velocity (m/s) of an object at time (t) is given by v = 4.0 + 2.0t.
(1) Calculate the magnitude of the force F acting on the object of mass m = 4.0kg.
(2) Calculate the kinetic energy (K) of the object of mass m = 4.0kg at time t = 3.0s.
(3) Setting the initial position x(subscript 0) = 0.0m of the object at time t = 0.0s, calculate the time (t>0.0s) at the position x=21m of the object.
 Relevant Equations:

F = ma
a = dv/dt
So far, I've only attempted the first number:
F = (4kg) [(4+2t)0]/t
?
Been thinking how to cancel out the time, but I really have no idea how to proceed. Was I supposed to cancel it even? Can someone please help and tell me how you would answer this? (And maybe show a solution as well so I can make sense of what to do when I encounter these problems again)
By the way, this is not homework. I'm just studying from exam papers online.
F = (4kg) [(4+2t)0]/t
?
Been thinking how to cancel out the time, but I really have no idea how to proceed. Was I supposed to cancel it even? Can someone please help and tell me how you would answer this? (And maybe show a solution as well so I can make sense of what to do when I encounter these problems again)
By the way, this is not homework. I'm just studying from exam papers online.