Question

who is the object of the mass 1000
kg is moving with a speed of 72 kilometre per hour and when the driver will we get stopped in 5 seconds calculate the distance covered by the vehicle after application of brakes​

Answer 1

Answer:

Distance = 180 km

Explanation:

Mass (m) = 1000 kg

Initial velocity (u) = 72 km/hr = 20 m/s

Time taken to stop (t) = 5 sec

Final velocity (v) = 0 km/hr

∴ Acceleration (a) = $\frac{v - u}{t}$ = v - u/t

a = 0 - 72/5

a = -14.4 km/s²  

By applying the second law of motion = S = ut + $\frac{1}{2}$at²

S is the distance = 72 × 5 + $\frac{1}{2}$(-14.4)25

S = 360 + (-7.2)25

S = 360 - 180

S = 180 km

I took the acceleration in km/s².

You can convert it into km/hr²