5. A vehicle starting from rest, attains a velocity 30m/s in 10 seconds. Calculate the acceleration and the distance travelled by the vehicle in 10sec. (Write the formula used, substitute the values, calculate the unknown and write the final answer with proper units) (4 marks) 6. The velocity time graph of an object is given below. Based on the graph what can you predict about the object's acceleration? (2 marks) An object of mass 5kg falls from a height 60m. What is its potential energy at 60m ? Also, what is its kinetic energy when the body reaches the ground? Given g=9.8m/s2. (write the formula used, substitute the values, calculate the unknown and write the final ansv with proper units) 8. State any two effects of ozone depletion on global environment. (2 mar Analyze Pond as an ecosystem and explain the biotic and abiotic factors related to pond. (5 ma Evaluate the effect of acid rain on the global environment. Based on the evaluation sug methods to reduce acid rain. (5ma cormula 1. Vt=V1+at 2. S=Vt+1/2at2 3. Vr2=V2+2aS 4. F=ma 5. a=(VrVi)/t 6. KE=1/2mv2 7. PE=mgh