# Shawn and his bike have a total mass of 52.8 kg.?

Shawn rides his bike 1.7 km in

14.9 min at a constant velocity.

The acceleration of gravity is 9.8 m/s

2

.

What is Shawn’s kinetic energy?

Answer in units of J.

### 4 Answers

- MyRankLv 63 weeks ago
Given,

Time (t) = 14.9mins = 894secMass (m) = 52.8kgAcceleration due to gravity (g) = 9.81m/sec²Distance (d) = 1.7km = 1.7 x 10³mKinetic Energy (K.E) = ?We know that:-Kinetic Energy (K.E) = ½mv²= ½ x 52.8kg x [distance (d) / time (t)]²= ½ x 52.8 x [1.7 x 10³ / 8.94]²= 152.592 x 10⁶/1788= 95.304 Joules≈ 95 Joules∴ Kinetic Energy (K.E) = 95 Joules.

Source(s): http://myrank.co.in/ - electron1Lv 73 weeks ago
The following equation is used to calculate kinetic energy.

KE = ½ * m * v^2

The velocity must be in m/s. One kilometer is 1000 meters. One minute is 60 seconds.

d = 1,700 meters

t = 14.9 * 60 = 894 seconds

v = 1,700/894

The bike’s velocity is approximately 1.90 m/s.

KE = ½ * 52.8 * (1,700/894)^2 = 76,296,000 ÷ 799,236

Rounded to three significant digits, the kinetic energy is 95.5J.

- oldschoolLv 73 weeks ago
Shawn and his bike have a total mass of 52.8 kg.?

Shawn rides his bike 1.7 km in 4.9 min at a constant velocity. The acceleration of gravity is 9.8 m/s

Δx/Δt = V = 1700/(4.9*60) = 5.7823m/s

What is Shawn’s kinetic energy? Answer in units of J.

½mV² = ½*52.8*5.7823² ≈ 883J <<<<<<

- Anonymous3 weeks ago
speed = distance/time

KE = 1/2 * mass * speed^2.