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.

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.

y2o2 · Answer

get the a 

where a =  -gsinθ = 9.81 * (4/7) = -5.605 m/s²

so use v² = u² + 2as

anonymous · Answer

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

dumbcow · Answer

yes that is correct