Question

Starting from rest a boy peddles his bicycle or 18 sec to acquire the velocity of 50m/sec then he applies the brakes in such a way that the bicycle comes to rest in next 5sec. Find the acceleration in both cases

Answer 1

Explanation:

v-u= at

case1

v=50

u=0

t=18s

v-u=at

50-0=a*18

50=18*a

a=2.7m/s²

case2

v=0

U=50

t=5s

-50=a*5

a= -10m/s²

Answer 2

Answer:

for 1 case a = v-u / t

a = 50 - 0 / 18

a = 2.77 ms-²

for 2 case a = 0- 50 / 5

a = -10 m/s²

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