Question

The driver of a vehicle moving with a speed of 72 km h-' sees a child standing in the middle of the road. She applies the brakes and brings the vehicle to rest just in time to save the child. If the time taken to stop the vehicle is 10 s and the mass of the driver and the vehicle is 500 kg, then the average retarding force on the vehicle is
A. 1 x 108 g cm s2 B. 1 × 104 g m s2
C. 1 x 10 kg cm s2 D. 1 × 102 kg m s2​

Answer 1

Answer:

pls brainliiest me...

Explanation:

ithink (b)

Answer 2

Initial velocity (u)= 72km/h = 72000m/3600s = 2000cm/s

Final velocity (v) = 0

Acceleration = v-u/t = 0-2000/10 = -200cm/s² (retardation)

Retardation force = mass × retardation = 500kg × 200 cm/s² = 500000g × 200cm/s²

= 100000000 g cm/s²

= 1× 10^8 g cm/s² (option A)

Hope it helps!

Fun fact - Today was my science Olympiad. I couldn't solve this question so I came to Brainly and ended up solving it for someone else XD