Question

Q.1
If 41.8 k cal heat is produced by applying the
brakes to stop a car of mass 800 kg. The speed
of the car before the brakes were applied, was -
(1) 15 m/s
(2) 20.9 m/s
(3) 25 m/s
(4) 30 m/s​

Answer 1

Answer:

20.9 m/s

Explanation:

if we divide 41.8 and 800kg we get 20.9

Answer 2

Answer:

2. 20.9 m/ s is the speed of the before brakes applied