Question

A scooter is travelling at a speed of 72 km/hr. The brakes are applied so as to produce a
uniform retardation of 4 ms^-2 Find how far the scooter goes before it stops?
a) 25 cm
b) 50 cm
c) 80cm
d) 20 cm​

Answer 1

Answer:

Explanation:

First convert 72km/he to m/s by multiplying it by 5/18.The result is 20.

Now using the eqn v^2- u^2=2as

0-20×20=2×-4×s

-400/-8=s

50=s

And is 50m but this is not in your options.

Answer 2

Answer:

b)50cm. is the correct option