Ineed on this question: a car has a velocity of 24 km/hr. the car stops. it takes the car 3 seconds to stop. what is the car’s acceleration?

Acceleration = (change in speed) / (time for the change)

Change in speed = (speed at the end) - (speed at the beginning)

Change in speed = (Zero) - (24 km/hour)

Change in speed = (-24 km/hr)

Acceleration = (-24 km/hr) / (3 sec)

Acceleration = -8 km/hr-sec

To give it more familiar units, multiply it by (1 hr / 3600 sec)

Acceleration = (-8 km/hr-sec) x (1hr / 3600sec)

Acceleration = (-8/3600) km/sec²

Acceleration = -0.0022... km/sec²

Acceleration = -2.2... m/s²

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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force is mass*acceleration.

we have a very small mass: 11.4*0.001 kg

if we want 0.035n of force, we need an acceleration:

0.035 = 11.4*0.001*a

a = 0.035/(11.4*0.001) m/s^2