1.

The position vector of a particle is givenby T -3ti +5t j+ 7k. Find the direction inwhich the particle experiences net force?

Answer»

The direction of force will be same as of the direction of its acceleration

so, we need to find the direction of acceleration "a"

now , r = 3ti + 5t²j + 7k

so, dr/dt = 3i+10tj + 0k

again d²r/dt² = a = 10j

so, the direction of force is in ĵ .



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