Question

a car travel at a uniform velocity of 50ms-1 for 10s and then brought to rest in 5s. Calculate the retardation of the car in the distance travelled in 15s
1. 10m/s2, 625m
2. 20m/s2, 625m
3. 10m/s, 225m
4. none of these

plz explain

Answer 1

U=50m/s2

V=0( car has stopped)

T=10-5=5sec

A=V-U/t

A=0-50/5

A=-10m/s2

And s=??

Ut+1/2at*t

50*15+1/2*10*15*15=s

750+1125=s

S=1875m

SO THE ANS. IS (D) none of the above