Question

how to calculate deceleration?

Answer 1

deceleration of what?

Answer 2

Xiao Long cycles down a slope from a rest with with a uniform acceleration of 1.25ms-2.He reaches the bottom in 14 seconds.Without stopping,he then cycles up an adjacent slope with a uniform deceleration until he comes to a rest after travelling a distance of 60m.Determine the acceleration.

Answer 3

determine the acceleration or deceleration?

Answer 4

deceleration

Answer 5

sorry typing errors

Answer 6

v=u+at
v=0+1.25*14
=17.5
v^2=u^2+2as
0=(17.5)^2+2a*60
-120a=306.25
a=-2.55m/s^2

Answer 7

is this a multiple choice question?

Answer 8

this is the answer. but wy the final velocity is equal to 0 ?

Answer 9

it is given that the cyclist finally comes to rest. that means the final velocity is 0. k?

Answer 10

got t?

Answer 11

I see. Thank so much ! ^^

Answer 12

u r welcome.

Answer 13

initial acceleration for this?

Answer 14

Deceleration is just an acceleration in opposite direction of velocity.

Answer 15

deceleration is just negative acceleration. It has the same formula as acceleration ie Deceleration=(original velocity-final velocity)/Time . The only difference is that the answer will be negative

Answer 16

yes

Answer 17

In physics you'd do well to forget the word "deceleration". Regardless of whether you're speeding up or slowing down, it's an acceleration in physics-speak. The only difference is the sign.

Answer 18

Thanks all ! I understand :)