Answer:
v = 14 m/s
Explanation:
given,
radius of dip = 40 m
The passengers in a roller coaster car feel 50% heavier than their true weight.
Apparent weight



When the car is at the bottom, the weight will be acting downwards and the centripetal force will also be acting downward where as Normal force which is apparent weight will be acting in upward direction.
now,





v = 14 m/s
Break into small particles. The heat causes the rock to break up and form pebbles or sand. Hope that helped. Have a nice day
The volume would be 287cm³. Multiply all the 3 numbers by each other