Question

Tuktuki paddles her bicycle of mass 10 kg to attain velocity 6m/s in 30s. Then she applies brakes that the velocity of bicycle come down to 4m/s in next 5s find (a) force applied by the brakes.

Answer 1

4 N is the right answer

u=6
v=4
t= 5
m= 10
a= v-u/t
F = ma
hope this help you

Answer 2

by using the formula:-
v=u+at
substituting the values in formula
4=6+(-a)5.....'-a' because the there is retardation
5a=6-4
5a=2
a=2/5
a=0.4m/s^2

by finding acceleration we can find force by using the formula
force=mass× acceleration
force=10×0.4
force=4Newton
therefore force applied by the brakes is 4N