The position of an object of mass 5 kg as a function of
time is giving by r = (20m/s4)t4
i + (12 m/s3)t3 j. Find the
force acting on the object as a
function of time. Express the
force in unit vectors. Hint:
Remember that Newton's
second Law relates the force
to the acceleration

Explanation:

Given that,

The mass of the object, m = 5 kg

The position vector is,

Velocity,

Acceleration,

Newton's second law of motion is given as follows:

F = ma

Put all the values,

Hence, this is the required solution.

explanation: magnetic pole, region at each end of a magnet where the external magnetic field is strongest. the south-seeking pole, or any pole similar to it, is called a south magnetic pole. unlike poles of different magnets attract each other; like poles repel each other.

prolly a beacuse the momentuem the car has increases while going down hill