A car is moving at a speed of 32 km/h; on applying the brakes, its speed reduces by 10 km/h every minute. After how many seconds will the car come to a halt?
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Answer:
t= 192 secs
Step-by-step explanation:
=) 32 k/h=8.8889 m/s
=) 22 k/h=6.11111111 m/s
=) 10 k/h=2.777778 m/s
10 k/h=2.777778 m/s
v=u+at
=) 6.11111 m/s=8.888889 m/s + 60a
=) -2.77777778 m/s=60a
=) a=-0.0462963 m/s²
=) 0=8.888889 m/s - 0.0462963 m/s² x t
0=8.888889 m/s - 0.0462963 m/s² xt t=192 secs
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