Question

Physics: Laws of Motion 13000 kg automobile is travelling at 36 kmph. Find the average force needed to stop it in half minute​

Answer 1

Answer:

9000

Explanation:

Given that,

Mass 'm'=2000kg

Initial velocity v

1

=54km/h=

60×60

54×1000

=15m/s

Distance 'd' =25m

Final velocity v

f

=0

v

f

2

−v

i

2

=2ad

0−225=2a×25

a=−

2

9

m/s

2

Therefore the deceleration −4.5m/s

2

F=mass×deceleration

F=2000×4.5=9000N

Hence, Option A is correct