A body A starts from rest with an acceleration `a_1`. After 2 s another body B starts from rest with an acceleration ar If they travel equal distance in the 5th second after the start of A. `a_1 : a_2` is equal to

Options

A. 5:9
B. 5:7
C. `9:5`
D. 9:7

Explanation

Distance travelled by the body =Area under Velocity-Time graph
d=Area of OAE+Area of AEDB+Area of BCD
`impliesd=(1/2xx10xx10)+(10xx10)+(1/2xx20xx10)`
`impliesd=50+100+100`
`:.d=250m`