Question

The distance travelled in t seconds by an object starting with speed of u metres / second and moving a long speed a straight line with increasing ab the rats of a metges / second every second by is given att = at² metres​

Answer 1

Given S=ut+

2

1

at

2

.(1)

Case:1 S=10m and t=2sec

Putting value of S and t in equation 1

∴10=2u+2a⇒u+a=5..(2)

Case:2 S=28m and t=4sec

Putting value of S and t in equation 1

∴28=4u+8a⇒2u+4a=14..(3)

Multiplying equation (2) by a and subtracting from equation (3)

2u+4a=14

−2u−2a=−10

2a=4⇒a=2

Putting the value of a in equation (2)

u+a=5⇒u=5−a=5−2=3