# OCR A physics helpWatch

#1
A ball is launched horizontally at 5 m s-1 from the end of a table. The ball is in flight for 0.4 s before it lands on the floor. The ball is now launched from the end of the same table with a horizontal velocity 10 m s-1.
What is the new time of flight of the ball? A 0.2s
B 0.4s
C 0.5s
D 0.8s
0
#2
The answer is B but how?
0
9 months ago
#3
The answer is B but how?
The vertical acceleration due to gravity is the same regardless of the horizontal component of velocity. distance fallen vertically is the same so time is the same.

you could shoot a crossbow bolt horizontally from the same table top at 100 ms-1 and it'd spend the same time falling (unless it his something else before the ground ) ... and so would a marble with zero horizontal velocity released from the same height
0
#4
(Original post by Joinedup)
The vertical acceleration due to gravity is the same regardless of the horizontal component of velocity. distance fallen vertically is the same so time is the same.

you could shoot a crossbow bolt horizontally from the same table top at 100 ms-1 and it'd spend the same time falling (unless it his something else before the ground ) ... and so would a marble with zero horizontal velocity released from the same height
Thank you, that makes perfect sense now
1
9 months ago
#5
Thank you, that makes perfect sense now
FYI: Classic demo of this (AKA monkey shooting)

0
X

new posts
Back
to top
Latest
My Feed

### Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

### See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

### University open days

• Regent's University London
Thu, 19 Sep '19
• Durham University
Fri, 20 Sep '19
• Loughborough University
Fri, 20 Sep '19

### Poll

Join the discussion

Rock (197)
24.32%
Pop (196)
24.2%
Jazz (33)
4.07%
Classical (46)
5.68%
Hip-Hop (153)
18.89%
Electronic (54)
6.67%
Indie (131)
16.17%