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i dont have a clue how to do these questions

1) Tennis player hits ball vertically at speed of 10m/s how high does it go?

2)Stone is dropped from a window 5m high at what speed does it hit the ground?

thanks in advance

1) Tennis player hits ball vertically at speed of 10m/s how high does it go?

2)Stone is dropped from a window 5m high at what speed does it hit the ground?

thanks in advance

I'll give you a hint. Use SUVAT equations. And use the fact that projectiles under free fall always have an acceleration or deceleration of g i.e. 9.8m/s2. And remember to use your signs carefully.

SUVAT equations Are they a level stuff? never heard of em could be coz we have bad teacher though!

welwyn i see what u mean by using GPE=KE but i dont know the mass so im kinda stuck

For both questions only way i know i could work em out is if i knew mass

welwyn i see what u mean by using GPE=KE but i dont know the mass so im kinda stuck

For both questions only way i know i could work em out is if i knew mass

if GPE = KE then the mass cancels from both sides.

and about 1) - use v^2 = u^2 + 2as

ie

the final velocity squared = the initial velocity squared + (2 x accn. of freefall x distance)

so

0 = 100 + (2 x -9.81 x s)

This is the easiest way, but I can't instantly think of a way with the mass.

welwyn

and about 1) - use v^2 = u^2 + 2as

ie

the final velocity squared = the initial velocity squared + (2 x accn. of freefall x distance)

so

0 = 100 + (2 x -9.81 x s)

This is the easiest way, but I can't instantly think of a way with the mass.

welwyn

For 1) i got 5-lol hope its correct

for 2) im still kinda confused

thanks again for help so far its REALLY been appreciated

for 2) im still kinda confused

thanks again for help so far its REALLY been appreciated

anon234

i dont have a clue how to do these questions

1) Tennis player hits ball vertically at speed of 10m/s how high does it go?

2)Stone is dropped from a window 5m high at what speed does it hit the ground?

thanks in advance

1) Tennis player hits ball vertically at speed of 10m/s how high does it go?

2)Stone is dropped from a window 5m high at what speed does it hit the ground?

thanks in advance

Use the equation v^2=u^2+2as

where v = final velocity

u = initial velocity

s = displacement

a = acceleration (9.81 m/s/s)

So

1) rearrange teh equation to make s the subject, u=10m/s, v = 0 m/s and a = 9.81 m/s/s

s = (v^2-u^2)/2a

= (0 - 100) / 19.62

= 5.1m (if you ignore the '-' sign)

2) use the normal equation v^2 = u^2 + 2as v = subject, u = 0 a = 9.81 s = 5

v^2 = 2*9.81*5

v^2 = 98.1

v = 9.9 m/s

Wow? These teachers are original. Studying GCSE Physics and would you believe it.... these questions came up in a homework task -10 years later!

how do you know that for question 1, u is equal to 10m/s?similarly for 2, how is s equal to 5?

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