After braking, the car moving at a uniform speed of 10m / s moves in a straight line with uniform deceleration. The displacement within 2S after braking is 6.25m, and that within 6S after braking is 6.25m

After braking, the car moving at a uniform speed of 10m / s moves in a straight line with uniform deceleration. The displacement within 2S after braking is 6.25m, and that within 6S after braking is 6.25m

A = 2.5 of 6.25 = (10-A) * T-1 / 2at square t = 1
Because 6 * 2.5 = 15m / S is greater than 10m / s, it has stopped after 4S
S = 10t-1 / 2at square t = 4S s = 20m
Because there will be no deceleration when the speed is zero... The car is stationary
It's the same old trap