Question

If v=(3i +4j +5k)m/s is the instantaneous velocity of a body of mass 1.5kg.Calculate its Kinetic energy.

Answer 1

SOLUTION.

As we know that notation that you use in this question is very useful and as well as a popular notation of representing direction of vectors.

if we write velocity like....

V = (x)i + (y)j + (z)k

where X,y,z are the magnitude of velocity along X,y,z direction and I,j,k are the unit vector along the corresponding directions.

Magnitude of V

|v| = √x²+y²+z²

Magnitude of velocity given in question...

|v| =√3²+4²+5²

|v| = √9+16+25

|v| = √50

|v| = 5√2m/sec

Kinetics energy = (1/2)mv²

Kinetic energy = (1/2)(1.5)(5√2)²

Kinetic energy = (1/2)(1.5)(50)

Kinetic energy = 37.5J

#answerwithquality

#BAL

Answer 2

Answer:

the before answer will help u lot

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