Resposta :
V²=Vo² + 2*a*/\S
0 = 20² + 2*a*50
-400 = 100a
a = -400/100
a= -4m/s² (sinal negativo=desaceleração).
**********************************************
Fr=m*a
Fr=1000*4
************
Fr=4000N
************
0 = 20² + 2*a*50
-400 = 100a
a = -400/100
a= -4m/s² (sinal negativo=desaceleração).
**********************************************
Fr=m*a
Fr=1000*4
************
Fr=4000N
************