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Can you make this assumption? M1

:confused:

A ball is projected upwards from a point which is 4m above ground with speed 18ms^-1

find the speed at which the ball hits the ground

isince the intial velocity of the ball 4m above will be 18, i assumed it will be the same on the way down when again its 4m above the ground

i then did s=-4m u=18 v=? a=-9.8 and plugged it in to get 20.1ms^-1

is it correct to assume this if now what other way can you work this part out?

thanks
devan5
:confused:

A ball is projected upwards from a point which is 4m above ground with speed 18ms^-1

find the speed at which the ball hits the ground

isince the intial velocity of the ball 4m above will be 18, i assumed it will be the same on the way down when again its 4m above the ground

i then did s=-4m u=18 v=? a=-9.8 and plugged it in to get 20.1ms^-1

is it correct to assume this if now what other way can you work this part out?

thanks


You're not making an assumption. s is displacement, the distance travelled from A to B, in a direct route. So let's say travelling upwards you have the distance x. Travelling downwards to the place it was thrown from -x. And then down to the ground you have -4m

x -x -4 = -4m

The initial speed will always be u
Reply 2
Avatar for abbii
abbii
11
yes you can assume it

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