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A pebble is projected vertically upwards with speed 21m/s from a point 32m above the ground.

Find the total time for which the pebble is more than 40m above the ground

Thanks
2. What have you done so far?
3. I have found the speed with which the pebble strikes the ground to be 33m/s (i.e. v)
4. (Original post by snoopyx)
I have found the speed with which the pebble strikes the ground to be 33m/s (i.e. v)
this is irrelevant.

there is an equation for displacement in terms of u a and t correct?

so you want to set this equal to 8. you'll get a quadratic in t with 2 roots, think about what this means in terms of the motion of the pebble.
5. (Original post by snoopyx)

A pebble is projected vertically upwards with speed 21m/s from a point 32m above the ground.

Find the total time for which the pebble is more than 40m above the ground

Thanks
Hint: Displacement

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