Question

a particle is projected with velocity 9m/s up a line of greatest slope of a smooth plane inclined at an angle a to the horizontal where sin a=4/7. find the speed of the particle when it has travelled 5m up the plane.

Answer 1

get the a

where a = -gsinθ = 9.81 * (4/7) = -5.605 m/s²

so use v² = u² + 2as

Answer 2

i get the answer 4.99m/s.is it correct?

Answer 3

yes that is correct