I havce a few phisics question I really need some help with?

Question

1) a cheeata runs eastward at a velocity of 27 m/s. 2 seconds later, it tackles its prey to the groud. What is the cheata's acceleration?

2) Any change in position over time is an example of_____ (motion or cceleration)


3)Does a change in acceleratioon affect acelerationn? and can u please explain why for this one


4)A kangarroo hops 60 m to the east in 5 s

what is its veloocity? why?

the kangaroo stops for a drink and then starts hoping again to the south, every second, the kangaroo's velocity increases 2.5 m/s. What is the kangaroos acceleration aftrer 5 seconds? why?

5)A southbound train is traveling at 40 km/hour. A waiter with a tray is walking on the opposite direcction on the train at 3 km/hour. On the tray is a fly walkin g soulth at 1 km/ hour, what's the velocity of the fly to the ground on which the train is traveling. why?

Answer 1

1) 0
2) motion
3) Yes, if you change accelaration, it is affected. It could be faster or slower.
4) 12 m/s east 60/5 = 12;2.5 m/s2, it's accelerating at a constant speed
5) 40 - 3 + 1 = 38km/hr, do you really need an explanation?

Answer 2

1) 13.5ms^-2

2) motion

3)yes

4) 12ms^-1, eastward ( velocity is a scalar quantity, jus have to indicate its direction)

accn = 2.5ms^-2

"every second, the kangaroo's velocity increases 2.5 m/s" ==> accn is the rate of change of velocity.

5) 38km/h

taking southbound to be +ve
velocity of fly relative to an observer on the train = (-3) + 1 = -2
velocity of the fly relative to a stationary observer onthe ground = 40 + (-2) = 38km/h

PS: you are quite dumb