Acharge particle moving through a magnetic field experiences a magnetic force. what is the angle between the magnetic field and the force on the particle?

The magnetic force on a moving charged particle is given by:

F = qv×B

F is the magnetic force vector, q is the charge, v is the velocity vector, and B is the magnetic field vector. Note that we are taking the cross product of qv and B, not multiplying scalar quantities.

The cross product of two vectors gives a third vector which is perpendicular to the original two vectors. The very nature of taking a cross product means that F will always be perpendicular to B, i.e. the angle between F and B will always be 90°.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the answer is kevlar