Question

A constant force is exerted on a cart that is initially at rest on an airtrack.Friction between the cart and the track is negligible.The force acts for a short time interval and gives the cart a certain final speed to reach the same final speed with a force that is only half as big,the force must be exerted on the cart for a time interval
A)four times as long as
B) twice as long as
C) equal to
D)half as long as
explain this and pls say answer in above options​

Answer 1

HOPE IT HELPS YOU.....