1. Suppose a car drive with velocity v=0.6t'. It starts at the 10 meter mark. a) how far does it go in the first 4 seconds? b) what is its position at the 4 second mark? c) how far does it go in the first t seconds? d) what is its position at the t second mark? 2. A falling object has acceleration 9.8 m/s2. a) What is the change in velocity in the first 4 seconds? Now suppose the initial velocity was 0. b) what is the velocity at time t? c) How far did it fall in the first 3 seconds? d) How far did it fall in t seconds? [e*] if it hits the ground after 5 seconds, from what height was it dropped? 3. For a spring with k=50, how much work is required to stretch it from equilibrium by 0.4 meters? 4. For a spring with k=85 and equilibrium length 0.6 meters, how much work is required to stretch it from 0.9 meters to 1.4 meters