A train accelerated from rest to a speed of 60m/s in 200 seconds it continues with the speed reached for 40 seconds before coming to a rest in another 40 seconds. sketch a velocity time graph and find the acceleration, deceleration , total distance covered and its average speed.

Iam pretty sure its b but if im wrong sorry

Aform of energy that is reflected or emitted from objects in the form of electrical and magnetic waves that can travel through space. there are many forms of  electromagnetic  energy including gamma rays, x rays, ultraviolet radiation, visible light, infrared radiation, microwaves and radio waves.