Danny kicks a ball at 5m/s at an angle of 20 degree above the horizontal and luke, who is standing north of danny, catches it. what direction is the ball's acceleration when it is at the apex ( top of its path ).
b) when the ball is halfway to the top of its path, what direction is its acceleration

you so much

Force=7.71KN in the opposite direction

Explanation:

Given the mass of the car(M)=1000Kg

The initial speed of the car(u)=100km/hr

we know that 1km/hr=5/18 m/sec

100km/hr=100*5/18 m/sec=27.77m/sec

the distance travelled before it stops (s)=50m

let the acceleration of the car be a

The final velocity of the car is 0.

we know that  

a=7.712m/

We know that F=Ma

F=1000* 7.712=7712N=7.71KN

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