Question

a car starts with 36 km /h to 72km/h in 5 s then it moves with uniformly for another 5s then it applies break and come to rest in 4s . draw the graph and find acceleration retardation average speed average velocity​

Answer 1

Solution☆

u=36km/hr=10ms−1

a=2.5ms−2,t=5sec

v=u+at

v=10+(2.5×5)

   =22.5ms−1

v2−u2=2as

⇒2×2.522.52−102=s

s=81.25m

Hope it helps you

Answer 2

GiVEN

• u =36 km/hr =36× 5/18 m/s=10m/s
• v = 72 km/hr=72× 5/18 m/s=20m/s
• t = 10 s

TO FIND

• a = ?

SOLUTION

we know THAT

v = u +at

20 = 10+ a 10

20-10 =10 a

10 = 10 a

a = 1 m/s²