Cutin is protective, hydrophobic, waxy covering produced by epidermal cells of leaves, young shoots and other aerial parts. It minimises the water lost through transpiration (with the help of stomata) and also reduces pathogen entry. Lignin hardens the cell wall ...

The flexibility in plants is due to Collenchyma. It also provides mechanical support to plants.

Given, s = ct₂ Here, c = constant of proportionally Acceleration, a = d₂s/dt₂ = d₂/dt₂ (ct₂) = 2c = constant So, the object is moving with a uniform acceleration.

a = dv/dt The increase in speed = (30 -12) = 18 m/s. Then, A = 18/15 = 1.2 metre per second square

In constant speed, acceleration does not change. So, it covers equal distances in equal time intervals.