Question

pls solve Q5 explain properly
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Answer 1

Explanation:

GIVEN .

displacement in x direction = 7t + 4t^3

displacement in y direction = 5t

now ,

acceleration = d^y / dt^2

therefore,

acceleration in x direction

= d^ ( 7t+4t^3)/dt^2

= 0 + 24 t

= 24 t

at the instant t= 5

acceleration = 24×5

= 120 m / s^2

acceleration in y direction = d^2 ( 5t )/ dt^2

= 0

therefore net acceleration,

is 120 m/ s^2

but this option is not given , plz check it